213aa67015
Do not write-protect the kernel read-only and __ro_after_init sections earlier than before mark_rodata_ro() is called. This fixes a boot issue on parisc which is triggered by commit91a1d97ef4
("jump_label,module: Don't alloc static_key_mod for __ro_after_init keys"). That commit may modify static key contents in the __ro_after_init section at bootup, so this section needs to be writable at least until mark_rodata_ro() is called. Signed-off-by: Helge Deller <deller@gmx.de> Reported-by: matoro <matoro_mailinglist_kernel@matoro.tk> Reported-by: Christoph Biedl <linux-kernel.bfrz@manchmal.in-ulm.de> Tested-by: Christoph Biedl <linux-kernel.bfrz@manchmal.in-ulm.de> Link: https://lore.kernel.org/linux-parisc/096cad5aada514255cd7b0b9dbafc768@matoro.tk/#r Fixes:91a1d97ef4
("jump_label,module: Don't alloc static_key_mod for __ro_after_init keys") Cc: stable@vger.kernel.org # v6.10+
1022 lines
26 KiB
C
1022 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/parisc/mm/init.c
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*
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* Copyright (C) 1995 Linus Torvalds
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* Copyright 1999 SuSE GmbH
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* changed by Philipp Rumpf
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* Copyright 1999 Philipp Rumpf (prumpf@tux.org)
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* Copyright 2004 Randolph Chung (tausq@debian.org)
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* Copyright 2006-2007 Helge Deller (deller@gmx.de)
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*
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*/
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/memblock.h>
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#include <linux/gfp.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/initrd.h>
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#include <linux/swap.h>
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#include <linux/unistd.h>
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#include <linux/nodemask.h> /* for node_online_map */
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#include <linux/pagemap.h> /* for release_pages */
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#include <linux/compat.h>
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#include <linux/execmem.h>
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#include <asm/pgalloc.h>
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#include <asm/tlb.h>
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#include <asm/pdc_chassis.h>
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#include <asm/mmzone.h>
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#include <asm/sections.h>
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#include <asm/msgbuf.h>
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#include <asm/sparsemem.h>
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#include <asm/asm-offsets.h>
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#include <asm/shmbuf.h>
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extern int data_start;
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extern void parisc_kernel_start(void); /* Kernel entry point in head.S */
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#if CONFIG_PGTABLE_LEVELS == 3
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pmd_t pmd0[PTRS_PER_PMD] __section(".data..vm0.pmd") __attribute__ ((aligned(PAGE_SIZE)));
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#endif
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pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".data..vm0.pgd") __attribute__ ((aligned(PAGE_SIZE)));
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pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __section(".data..vm0.pte") __attribute__ ((aligned(PAGE_SIZE)));
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static struct resource data_resource = {
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.name = "Kernel data",
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.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
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};
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static struct resource code_resource = {
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.name = "Kernel code",
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.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
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};
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static struct resource pdcdata_resource = {
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.name = "PDC data (Page Zero)",
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.start = 0,
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.end = 0x9ff,
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.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
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};
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static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __ro_after_init;
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/* The following array is initialized from the firmware specific
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* information retrieved in kernel/inventory.c.
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*/
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physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __initdata;
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int npmem_ranges __initdata;
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#ifdef CONFIG_64BIT
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#define MAX_MEM (1UL << MAX_PHYSMEM_BITS)
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#else /* !CONFIG_64BIT */
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#define MAX_MEM (3584U*1024U*1024U)
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#endif /* !CONFIG_64BIT */
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static unsigned long mem_limit __read_mostly = MAX_MEM;
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static void __init mem_limit_func(void)
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{
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char *cp, *end;
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unsigned long limit;
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/* We need this before __setup() functions are called */
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limit = MAX_MEM;
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for (cp = boot_command_line; *cp; ) {
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if (memcmp(cp, "mem=", 4) == 0) {
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cp += 4;
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limit = memparse(cp, &end);
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if (end != cp)
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break;
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cp = end;
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} else {
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while (*cp != ' ' && *cp)
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++cp;
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while (*cp == ' ')
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++cp;
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}
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}
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if (limit < mem_limit)
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mem_limit = limit;
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}
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#define MAX_GAP (0x40000000UL >> PAGE_SHIFT)
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static void __init setup_bootmem(void)
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{
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unsigned long mem_max;
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#ifndef CONFIG_SPARSEMEM
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physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1];
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int npmem_holes;
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#endif
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int i, sysram_resource_count;
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disable_sr_hashing(); /* Turn off space register hashing */
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/*
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* Sort the ranges. Since the number of ranges is typically
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* small, and performance is not an issue here, just do
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* a simple insertion sort.
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*/
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for (i = 1; i < npmem_ranges; i++) {
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int j;
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for (j = i; j > 0; j--) {
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if (pmem_ranges[j-1].start_pfn <
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pmem_ranges[j].start_pfn) {
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break;
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}
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swap(pmem_ranges[j-1], pmem_ranges[j]);
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}
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}
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#ifndef CONFIG_SPARSEMEM
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/*
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* Throw out ranges that are too far apart (controlled by
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* MAX_GAP).
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*/
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for (i = 1; i < npmem_ranges; i++) {
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if (pmem_ranges[i].start_pfn -
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(pmem_ranges[i-1].start_pfn +
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pmem_ranges[i-1].pages) > MAX_GAP) {
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npmem_ranges = i;
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printk("Large gap in memory detected (%ld pages). "
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"Consider turning on CONFIG_SPARSEMEM\n",
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pmem_ranges[i].start_pfn -
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(pmem_ranges[i-1].start_pfn +
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pmem_ranges[i-1].pages));
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break;
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}
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}
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#endif
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/* Print the memory ranges */
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pr_info("Memory Ranges:\n");
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for (i = 0; i < npmem_ranges; i++) {
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struct resource *res = &sysram_resources[i];
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unsigned long start;
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unsigned long size;
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size = (pmem_ranges[i].pages << PAGE_SHIFT);
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start = (pmem_ranges[i].start_pfn << PAGE_SHIFT);
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pr_info("%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n",
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i, start, start + (size - 1), size >> 20);
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/* request memory resource */
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res->name = "System RAM";
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res->start = start;
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res->end = start + size - 1;
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res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
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request_resource(&iomem_resource, res);
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}
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sysram_resource_count = npmem_ranges;
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/*
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* For 32 bit kernels we limit the amount of memory we can
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* support, in order to preserve enough kernel address space
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* for other purposes. For 64 bit kernels we don't normally
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* limit the memory, but this mechanism can be used to
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* artificially limit the amount of memory (and it is written
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* to work with multiple memory ranges).
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*/
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mem_limit_func(); /* check for "mem=" argument */
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mem_max = 0;
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for (i = 0; i < npmem_ranges; i++) {
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unsigned long rsize;
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rsize = pmem_ranges[i].pages << PAGE_SHIFT;
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if ((mem_max + rsize) > mem_limit) {
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printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20);
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if (mem_max == mem_limit)
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npmem_ranges = i;
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else {
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pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT)
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- (mem_max >> PAGE_SHIFT);
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npmem_ranges = i + 1;
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mem_max = mem_limit;
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}
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break;
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}
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mem_max += rsize;
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}
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printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20);
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#ifndef CONFIG_SPARSEMEM
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/* Merge the ranges, keeping track of the holes */
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{
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unsigned long end_pfn;
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unsigned long hole_pages;
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npmem_holes = 0;
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end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages;
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for (i = 1; i < npmem_ranges; i++) {
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hole_pages = pmem_ranges[i].start_pfn - end_pfn;
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if (hole_pages) {
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pmem_holes[npmem_holes].start_pfn = end_pfn;
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pmem_holes[npmem_holes++].pages = hole_pages;
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end_pfn += hole_pages;
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}
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end_pfn += pmem_ranges[i].pages;
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}
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pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn;
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npmem_ranges = 1;
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}
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#endif
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/*
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* Initialize and free the full range of memory in each range.
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*/
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max_pfn = 0;
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for (i = 0; i < npmem_ranges; i++) {
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unsigned long start_pfn;
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unsigned long npages;
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unsigned long start;
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unsigned long size;
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start_pfn = pmem_ranges[i].start_pfn;
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npages = pmem_ranges[i].pages;
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start = start_pfn << PAGE_SHIFT;
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size = npages << PAGE_SHIFT;
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/* add system RAM memblock */
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memblock_add(start, size);
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if ((start_pfn + npages) > max_pfn)
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max_pfn = start_pfn + npages;
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}
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/*
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* We can't use memblock top-down allocations because we only
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* created the initial mapping up to KERNEL_INITIAL_SIZE in
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* the assembly bootup code.
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*/
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memblock_set_bottom_up(true);
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/* IOMMU is always used to access "high mem" on those boxes
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* that can support enough mem that a PCI device couldn't
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* directly DMA to any physical addresses.
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* ISA DMA support will need to revisit this.
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*/
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max_low_pfn = max_pfn;
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/* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */
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#define PDC_CONSOLE_IO_IODC_SIZE 32768
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memblock_reserve(0UL, (unsigned long)(PAGE0->mem_free +
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PDC_CONSOLE_IO_IODC_SIZE));
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memblock_reserve(__pa(KERNEL_BINARY_TEXT_START),
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(unsigned long)(_end - KERNEL_BINARY_TEXT_START));
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#ifndef CONFIG_SPARSEMEM
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/* reserve the holes */
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for (i = 0; i < npmem_holes; i++) {
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memblock_reserve((pmem_holes[i].start_pfn << PAGE_SHIFT),
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(pmem_holes[i].pages << PAGE_SHIFT));
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}
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#endif
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#ifdef CONFIG_BLK_DEV_INITRD
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if (initrd_start) {
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printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end);
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if (__pa(initrd_start) < mem_max) {
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unsigned long initrd_reserve;
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if (__pa(initrd_end) > mem_max) {
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initrd_reserve = mem_max - __pa(initrd_start);
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} else {
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initrd_reserve = initrd_end - initrd_start;
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}
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initrd_below_start_ok = 1;
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printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max);
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memblock_reserve(__pa(initrd_start), initrd_reserve);
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}
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}
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#endif
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data_resource.start = virt_to_phys(&data_start);
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data_resource.end = virt_to_phys(_end) - 1;
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code_resource.start = virt_to_phys(_text);
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code_resource.end = virt_to_phys(&data_start)-1;
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/* We don't know which region the kernel will be in, so try
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* all of them.
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*/
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for (i = 0; i < sysram_resource_count; i++) {
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struct resource *res = &sysram_resources[i];
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request_resource(res, &code_resource);
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request_resource(res, &data_resource);
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}
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request_resource(&sysram_resources[0], &pdcdata_resource);
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/* Initialize Page Deallocation Table (PDT) and check for bad memory. */
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pdc_pdt_init();
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memblock_allow_resize();
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memblock_dump_all();
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}
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static bool kernel_set_to_readonly;
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static void __ref map_pages(unsigned long start_vaddr,
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unsigned long start_paddr, unsigned long size,
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pgprot_t pgprot, int force)
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{
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pmd_t *pmd;
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pte_t *pg_table;
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unsigned long end_paddr;
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unsigned long start_pmd;
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unsigned long start_pte;
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unsigned long tmp1;
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unsigned long tmp2;
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unsigned long address;
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unsigned long vaddr;
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unsigned long ro_start;
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unsigned long ro_end;
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unsigned long kernel_start, kernel_end;
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ro_start = __pa((unsigned long)_text);
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ro_end = __pa((unsigned long)&data_start);
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kernel_start = __pa((unsigned long)&__init_begin);
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kernel_end = __pa((unsigned long)&_end);
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end_paddr = start_paddr + size;
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/* for 2-level configuration PTRS_PER_PMD is 0 so start_pmd will be 0 */
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start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
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start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
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address = start_paddr;
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vaddr = start_vaddr;
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while (address < end_paddr) {
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pgd_t *pgd = pgd_offset_k(vaddr);
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p4d_t *p4d = p4d_offset(pgd, vaddr);
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pud_t *pud = pud_offset(p4d, vaddr);
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#if CONFIG_PGTABLE_LEVELS == 3
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if (pud_none(*pud)) {
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pmd = memblock_alloc(PAGE_SIZE << PMD_TABLE_ORDER,
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PAGE_SIZE << PMD_TABLE_ORDER);
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if (!pmd)
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panic("pmd allocation failed.\n");
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pud_populate(NULL, pud, pmd);
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}
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#endif
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pmd = pmd_offset(pud, vaddr);
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for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) {
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if (pmd_none(*pmd)) {
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pg_table = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
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if (!pg_table)
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panic("page table allocation failed\n");
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pmd_populate_kernel(NULL, pmd, pg_table);
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}
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pg_table = pte_offset_kernel(pmd, vaddr);
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for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) {
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pte_t pte;
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pgprot_t prot;
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bool huge = false;
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if (force) {
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prot = pgprot;
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} else if (address < kernel_start || address >= kernel_end) {
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/* outside kernel memory */
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prot = PAGE_KERNEL;
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} else if (!kernel_set_to_readonly) {
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/* still initializing, allow writing to RO memory */
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prot = PAGE_KERNEL_RWX;
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huge = true;
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} else if (address >= ro_start) {
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/* Code (ro) and Data areas */
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prot = (address < ro_end) ?
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PAGE_KERNEL_EXEC : PAGE_KERNEL;
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huge = true;
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} else {
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prot = PAGE_KERNEL;
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}
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pte = __mk_pte(address, prot);
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if (huge)
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pte = pte_mkhuge(pte);
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|
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if (address >= end_paddr)
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break;
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set_pte(pg_table, pte);
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address += PAGE_SIZE;
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vaddr += PAGE_SIZE;
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}
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start_pte = 0;
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|
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if (address >= end_paddr)
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break;
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}
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start_pmd = 0;
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}
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}
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|
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void __init set_kernel_text_rw(int enable_read_write)
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{
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unsigned long start = (unsigned long) __init_begin;
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unsigned long end = (unsigned long) &data_start;
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map_pages(start, __pa(start), end-start,
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PAGE_KERNEL_RWX, enable_read_write ? 1:0);
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|
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/* force the kernel to see the new page table entries */
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flush_cache_all();
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flush_tlb_all();
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}
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|
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void free_initmem(void)
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{
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unsigned long init_begin = (unsigned long)__init_begin;
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unsigned long init_end = (unsigned long)__init_end;
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unsigned long kernel_end = (unsigned long)&_end;
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/* Remap kernel text and data, but do not touch init section yet. */
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map_pages(init_end, __pa(init_end), kernel_end - init_end,
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PAGE_KERNEL, 0);
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|
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/* The init text pages are marked R-X. We have to
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|
* flush the icache and mark them RW-
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*
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* Do a dummy remap of the data section first (the data
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* section is already PAGE_KERNEL) to pull in the TLB entries
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* for map_kernel */
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map_pages(init_begin, __pa(init_begin), init_end - init_begin,
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PAGE_KERNEL_RWX, 1);
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/* now remap at PAGE_KERNEL since the TLB is pre-primed to execute
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* map_pages */
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map_pages(init_begin, __pa(init_begin), init_end - init_begin,
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PAGE_KERNEL, 1);
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|
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/* force the kernel to see the new TLB entries */
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__flush_tlb_range(0, init_begin, kernel_end);
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|
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/* finally dump all the instructions which were cached, since the
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* pages are no-longer executable */
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flush_icache_range(init_begin, init_end);
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free_initmem_default(POISON_FREE_INITMEM);
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|
|
/* set up a new led state on systems shipped LED State panel */
|
|
pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_STRICT_KERNEL_RWX
|
|
void mark_rodata_ro(void)
|
|
{
|
|
unsigned long start = (unsigned long) &__start_rodata;
|
|
unsigned long end = (unsigned long) &__end_rodata;
|
|
|
|
pr_info("Write protecting the kernel read-only data: %luk\n",
|
|
(end - start) >> 10);
|
|
|
|
kernel_set_to_readonly = true;
|
|
map_pages(start, __pa(start), end - start, PAGE_KERNEL, 0);
|
|
|
|
/* force the kernel to see the new page table entries */
|
|
flush_cache_all();
|
|
flush_tlb_all();
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Just an arbitrary offset to serve as a "hole" between mapping areas
|
|
* (between top of physical memory and a potential pcxl dma mapping
|
|
* area, and below the vmalloc mapping area).
|
|
*
|
|
* The current 32K value just means that there will be a 32K "hole"
|
|
* between mapping areas. That means that any out-of-bounds memory
|
|
* accesses will hopefully be caught. The vmalloc() routines leaves
|
|
* a hole of 4kB between each vmalloced area for the same reason.
|
|
*/
|
|
|
|
/* Leave room for gateway page expansion */
|
|
#if KERNEL_MAP_START < GATEWAY_PAGE_SIZE
|
|
#error KERNEL_MAP_START is in gateway reserved region
|
|
#endif
|
|
#define MAP_START (KERNEL_MAP_START)
|
|
|
|
#define VM_MAP_OFFSET (32*1024)
|
|
#define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \
|
|
& ~(VM_MAP_OFFSET-1)))
|
|
|
|
void *parisc_vmalloc_start __ro_after_init;
|
|
EXPORT_SYMBOL(parisc_vmalloc_start);
|
|
|
|
void __init mem_init(void)
|
|
{
|
|
/* Do sanity checks on IPC (compat) structures */
|
|
BUILD_BUG_ON(sizeof(struct ipc64_perm) != 48);
|
|
#ifndef CONFIG_64BIT
|
|
BUILD_BUG_ON(sizeof(struct semid64_ds) != 80);
|
|
BUILD_BUG_ON(sizeof(struct msqid64_ds) != 104);
|
|
BUILD_BUG_ON(sizeof(struct shmid64_ds) != 104);
|
|
#endif
|
|
#ifdef CONFIG_COMPAT
|
|
BUILD_BUG_ON(sizeof(struct compat_ipc64_perm) != sizeof(struct ipc64_perm));
|
|
BUILD_BUG_ON(sizeof(struct compat_semid64_ds) != 80);
|
|
BUILD_BUG_ON(sizeof(struct compat_msqid64_ds) != 104);
|
|
BUILD_BUG_ON(sizeof(struct compat_shmid64_ds) != 104);
|
|
#endif
|
|
|
|
/* Do sanity checks on page table constants */
|
|
BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t));
|
|
BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t));
|
|
BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t));
|
|
BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD
|
|
> BITS_PER_LONG);
|
|
#if CONFIG_PGTABLE_LEVELS == 3
|
|
BUILD_BUG_ON(PT_INITIAL > PTRS_PER_PMD);
|
|
#else
|
|
BUILD_BUG_ON(PT_INITIAL > PTRS_PER_PGD);
|
|
#endif
|
|
|
|
#ifdef CONFIG_64BIT
|
|
/* avoid ldil_%L() asm statements to sign-extend into upper 32-bits */
|
|
BUILD_BUG_ON(__PAGE_OFFSET >= 0x80000000);
|
|
BUILD_BUG_ON(TMPALIAS_MAP_START >= 0x80000000);
|
|
#endif
|
|
|
|
high_memory = __va((max_pfn << PAGE_SHIFT));
|
|
set_max_mapnr(max_low_pfn);
|
|
memblock_free_all();
|
|
|
|
#ifdef CONFIG_PA11
|
|
if (boot_cpu_data.cpu_type == pcxl2 || boot_cpu_data.cpu_type == pcxl) {
|
|
pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);
|
|
parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start
|
|
+ PCXL_DMA_MAP_SIZE);
|
|
} else
|
|
#endif
|
|
parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START);
|
|
|
|
#if 0
|
|
/*
|
|
* Do not expose the virtual kernel memory layout to userspace.
|
|
* But keep code for debugging purposes.
|
|
*/
|
|
printk("virtual kernel memory layout:\n"
|
|
" vmalloc : 0x%px - 0x%px (%4ld MB)\n"
|
|
" fixmap : 0x%px - 0x%px (%4ld kB)\n"
|
|
" memory : 0x%px - 0x%px (%4ld MB)\n"
|
|
" .init : 0x%px - 0x%px (%4ld kB)\n"
|
|
" .data : 0x%px - 0x%px (%4ld kB)\n"
|
|
" .text : 0x%px - 0x%px (%4ld kB)\n",
|
|
|
|
(void*)VMALLOC_START, (void*)VMALLOC_END,
|
|
(VMALLOC_END - VMALLOC_START) >> 20,
|
|
|
|
(void *)FIXMAP_START, (void *)(FIXMAP_START + FIXMAP_SIZE),
|
|
(unsigned long)(FIXMAP_SIZE / 1024),
|
|
|
|
__va(0), high_memory,
|
|
((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
|
|
|
|
__init_begin, __init_end,
|
|
((unsigned long)__init_end - (unsigned long)__init_begin) >> 10,
|
|
|
|
_etext, _edata,
|
|
((unsigned long)_edata - (unsigned long)_etext) >> 10,
|
|
|
|
_text, _etext,
|
|
((unsigned long)_etext - (unsigned long)_text) >> 10);
|
|
#endif
|
|
}
|
|
|
|
unsigned long *empty_zero_page __ro_after_init;
|
|
EXPORT_SYMBOL(empty_zero_page);
|
|
|
|
/*
|
|
* pagetable_init() sets up the page tables
|
|
*
|
|
* Note that gateway_init() places the Linux gateway page at page 0.
|
|
* Since gateway pages cannot be dereferenced this has the desirable
|
|
* side effect of trapping those pesky NULL-reference errors in the
|
|
* kernel.
|
|
*/
|
|
static void __init pagetable_init(void)
|
|
{
|
|
int range;
|
|
|
|
/* Map each physical memory range to its kernel vaddr */
|
|
|
|
for (range = 0; range < npmem_ranges; range++) {
|
|
unsigned long start_paddr;
|
|
unsigned long size;
|
|
|
|
start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;
|
|
size = pmem_ranges[range].pages << PAGE_SHIFT;
|
|
|
|
map_pages((unsigned long)__va(start_paddr), start_paddr,
|
|
size, PAGE_KERNEL, 0);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
if (initrd_end && initrd_end > mem_limit) {
|
|
printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end);
|
|
map_pages(initrd_start, __pa(initrd_start),
|
|
initrd_end - initrd_start, PAGE_KERNEL, 0);
|
|
}
|
|
#endif
|
|
|
|
empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
|
|
if (!empty_zero_page)
|
|
panic("zero page allocation failed.\n");
|
|
|
|
}
|
|
|
|
static void __init gateway_init(void)
|
|
{
|
|
unsigned long linux_gateway_page_addr;
|
|
/* FIXME: This is 'const' in order to trick the compiler
|
|
into not treating it as DP-relative data. */
|
|
extern void * const linux_gateway_page;
|
|
|
|
linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK;
|
|
|
|
/*
|
|
* Setup Linux Gateway page.
|
|
*
|
|
* The Linux gateway page will reside in kernel space (on virtual
|
|
* page 0), so it doesn't need to be aliased into user space.
|
|
*/
|
|
|
|
map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page),
|
|
PAGE_SIZE, PAGE_GATEWAY, 1);
|
|
}
|
|
|
|
static void __init fixmap_init(void)
|
|
{
|
|
unsigned long addr = FIXMAP_START;
|
|
unsigned long end = FIXMAP_START + FIXMAP_SIZE;
|
|
pgd_t *pgd = pgd_offset_k(addr);
|
|
p4d_t *p4d = p4d_offset(pgd, addr);
|
|
pud_t *pud = pud_offset(p4d, addr);
|
|
pmd_t *pmd;
|
|
|
|
BUILD_BUG_ON(FIXMAP_SIZE > PMD_SIZE);
|
|
|
|
#if CONFIG_PGTABLE_LEVELS == 3
|
|
if (pud_none(*pud)) {
|
|
pmd = memblock_alloc(PAGE_SIZE << PMD_TABLE_ORDER,
|
|
PAGE_SIZE << PMD_TABLE_ORDER);
|
|
if (!pmd)
|
|
panic("fixmap: pmd allocation failed.\n");
|
|
pud_populate(NULL, pud, pmd);
|
|
}
|
|
#endif
|
|
|
|
pmd = pmd_offset(pud, addr);
|
|
do {
|
|
pte_t *pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
|
|
if (!pte)
|
|
panic("fixmap: pte allocation failed.\n");
|
|
|
|
pmd_populate_kernel(&init_mm, pmd, pte);
|
|
|
|
addr += PAGE_SIZE;
|
|
} while (addr < end);
|
|
}
|
|
|
|
static void __init parisc_bootmem_free(void)
|
|
{
|
|
unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, };
|
|
|
|
max_zone_pfn[0] = memblock_end_of_DRAM();
|
|
|
|
free_area_init(max_zone_pfn);
|
|
}
|
|
|
|
void __init paging_init(void)
|
|
{
|
|
setup_bootmem();
|
|
pagetable_init();
|
|
gateway_init();
|
|
fixmap_init();
|
|
flush_cache_all_local(); /* start with known state */
|
|
flush_tlb_all_local(NULL);
|
|
|
|
sparse_init();
|
|
parisc_bootmem_free();
|
|
}
|
|
|
|
static void alloc_btlb(unsigned long start, unsigned long end, int *slot,
|
|
unsigned long entry_info)
|
|
{
|
|
const int slot_max = btlb_info.fixed_range_info.num_comb;
|
|
int min_num_pages = btlb_info.min_size;
|
|
unsigned long size;
|
|
|
|
/* map at minimum 4 pages */
|
|
if (min_num_pages < 4)
|
|
min_num_pages = 4;
|
|
|
|
size = HUGEPAGE_SIZE;
|
|
while (start < end && *slot < slot_max && size >= PAGE_SIZE) {
|
|
/* starting address must have same alignment as size! */
|
|
/* if correctly aligned and fits in double size, increase */
|
|
if (((start & (2 * size - 1)) == 0) &&
|
|
(end - start) >= (2 * size)) {
|
|
size <<= 1;
|
|
continue;
|
|
}
|
|
/* if current size alignment is too big, try smaller size */
|
|
if ((start & (size - 1)) != 0) {
|
|
size >>= 1;
|
|
continue;
|
|
}
|
|
if ((end - start) >= size) {
|
|
if ((size >> PAGE_SHIFT) >= min_num_pages)
|
|
pdc_btlb_insert(start >> PAGE_SHIFT, __pa(start) >> PAGE_SHIFT,
|
|
size >> PAGE_SHIFT, entry_info, *slot);
|
|
(*slot)++;
|
|
start += size;
|
|
continue;
|
|
}
|
|
size /= 2;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
void btlb_init_per_cpu(void)
|
|
{
|
|
unsigned long s, t, e;
|
|
int slot;
|
|
|
|
/* BTLBs are not available on 64-bit CPUs */
|
|
if (IS_ENABLED(CONFIG_PA20))
|
|
return;
|
|
else if (pdc_btlb_info(&btlb_info) < 0) {
|
|
memset(&btlb_info, 0, sizeof btlb_info);
|
|
}
|
|
|
|
/* insert BLTLBs for code and data segments */
|
|
s = (uintptr_t) dereference_function_descriptor(&_stext);
|
|
e = (uintptr_t) dereference_function_descriptor(&_etext);
|
|
t = (uintptr_t) dereference_function_descriptor(&_sdata);
|
|
BUG_ON(t != e);
|
|
|
|
/* code segments */
|
|
slot = 0;
|
|
alloc_btlb(s, e, &slot, 0x13800000);
|
|
|
|
/* sanity check */
|
|
t = (uintptr_t) dereference_function_descriptor(&_edata);
|
|
e = (uintptr_t) dereference_function_descriptor(&__bss_start);
|
|
BUG_ON(t != e);
|
|
|
|
/* data segments */
|
|
s = (uintptr_t) dereference_function_descriptor(&_sdata);
|
|
e = (uintptr_t) dereference_function_descriptor(&__bss_stop);
|
|
alloc_btlb(s, e, &slot, 0x11800000);
|
|
}
|
|
|
|
#ifdef CONFIG_PA20
|
|
|
|
/*
|
|
* Currently, all PA20 chips have 18 bit protection IDs, which is the
|
|
* limiting factor (space ids are 32 bits).
|
|
*/
|
|
|
|
#define NR_SPACE_IDS 262144
|
|
|
|
#else
|
|
|
|
/*
|
|
* Currently we have a one-to-one relationship between space IDs and
|
|
* protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only
|
|
* support 15 bit protection IDs, so that is the limiting factor.
|
|
* PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's
|
|
* probably not worth the effort for a special case here.
|
|
*/
|
|
|
|
#define NR_SPACE_IDS 32768
|
|
|
|
#endif /* !CONFIG_PA20 */
|
|
|
|
#define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2)
|
|
#define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long)))
|
|
|
|
static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */
|
|
static unsigned long dirty_space_id[SID_ARRAY_SIZE];
|
|
static unsigned long space_id_index;
|
|
static unsigned long free_space_ids = NR_SPACE_IDS - 1;
|
|
static unsigned long dirty_space_ids;
|
|
|
|
static DEFINE_SPINLOCK(sid_lock);
|
|
|
|
unsigned long alloc_sid(void)
|
|
{
|
|
unsigned long index;
|
|
|
|
spin_lock(&sid_lock);
|
|
|
|
if (free_space_ids == 0) {
|
|
if (dirty_space_ids != 0) {
|
|
spin_unlock(&sid_lock);
|
|
flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */
|
|
spin_lock(&sid_lock);
|
|
}
|
|
BUG_ON(free_space_ids == 0);
|
|
}
|
|
|
|
free_space_ids--;
|
|
|
|
index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
|
|
space_id[BIT_WORD(index)] |= BIT_MASK(index);
|
|
space_id_index = index;
|
|
|
|
spin_unlock(&sid_lock);
|
|
|
|
return index << SPACEID_SHIFT;
|
|
}
|
|
|
|
void free_sid(unsigned long spaceid)
|
|
{
|
|
unsigned long index = spaceid >> SPACEID_SHIFT;
|
|
unsigned long *dirty_space_offset, mask;
|
|
|
|
dirty_space_offset = &dirty_space_id[BIT_WORD(index)];
|
|
mask = BIT_MASK(index);
|
|
|
|
spin_lock(&sid_lock);
|
|
|
|
BUG_ON(*dirty_space_offset & mask); /* attempt to free space id twice */
|
|
|
|
*dirty_space_offset |= mask;
|
|
dirty_space_ids++;
|
|
|
|
spin_unlock(&sid_lock);
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_SMP
|
|
static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array)
|
|
{
|
|
int i;
|
|
|
|
/* NOTE: sid_lock must be held upon entry */
|
|
|
|
*ndirtyptr = dirty_space_ids;
|
|
if (dirty_space_ids != 0) {
|
|
for (i = 0; i < SID_ARRAY_SIZE; i++) {
|
|
dirty_array[i] = dirty_space_id[i];
|
|
dirty_space_id[i] = 0;
|
|
}
|
|
dirty_space_ids = 0;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array)
|
|
{
|
|
int i;
|
|
|
|
/* NOTE: sid_lock must be held upon entry */
|
|
|
|
if (ndirty != 0) {
|
|
for (i = 0; i < SID_ARRAY_SIZE; i++) {
|
|
space_id[i] ^= dirty_array[i];
|
|
}
|
|
|
|
free_space_ids += ndirty;
|
|
space_id_index = 0;
|
|
}
|
|
}
|
|
|
|
#else /* CONFIG_SMP */
|
|
|
|
static void recycle_sids(void)
|
|
{
|
|
int i;
|
|
|
|
/* NOTE: sid_lock must be held upon entry */
|
|
|
|
if (dirty_space_ids != 0) {
|
|
for (i = 0; i < SID_ARRAY_SIZE; i++) {
|
|
space_id[i] ^= dirty_space_id[i];
|
|
dirty_space_id[i] = 0;
|
|
}
|
|
|
|
free_space_ids += dirty_space_ids;
|
|
dirty_space_ids = 0;
|
|
space_id_index = 0;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is
|
|
* purged, we can safely reuse the space ids that were released but
|
|
* not flushed from the tlb.
|
|
*/
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
static unsigned long recycle_ndirty;
|
|
static unsigned long recycle_dirty_array[SID_ARRAY_SIZE];
|
|
static unsigned int recycle_inuse;
|
|
|
|
void flush_tlb_all(void)
|
|
{
|
|
int do_recycle;
|
|
|
|
do_recycle = 0;
|
|
spin_lock(&sid_lock);
|
|
__inc_irq_stat(irq_tlb_count);
|
|
if (dirty_space_ids > RECYCLE_THRESHOLD) {
|
|
BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */
|
|
get_dirty_sids(&recycle_ndirty,recycle_dirty_array);
|
|
recycle_inuse++;
|
|
do_recycle++;
|
|
}
|
|
spin_unlock(&sid_lock);
|
|
on_each_cpu(flush_tlb_all_local, NULL, 1);
|
|
if (do_recycle) {
|
|
spin_lock(&sid_lock);
|
|
recycle_sids(recycle_ndirty,recycle_dirty_array);
|
|
recycle_inuse = 0;
|
|
spin_unlock(&sid_lock);
|
|
}
|
|
}
|
|
#else
|
|
void flush_tlb_all(void)
|
|
{
|
|
spin_lock(&sid_lock);
|
|
__inc_irq_stat(irq_tlb_count);
|
|
flush_tlb_all_local(NULL);
|
|
recycle_sids();
|
|
spin_unlock(&sid_lock);
|
|
}
|
|
#endif
|
|
|
|
static const pgprot_t protection_map[16] = {
|
|
[VM_NONE] = PAGE_NONE,
|
|
[VM_READ] = PAGE_READONLY,
|
|
[VM_WRITE] = PAGE_NONE,
|
|
[VM_WRITE | VM_READ] = PAGE_READONLY,
|
|
[VM_EXEC] = PAGE_EXECREAD,
|
|
[VM_EXEC | VM_READ] = PAGE_EXECREAD,
|
|
[VM_EXEC | VM_WRITE] = PAGE_EXECREAD,
|
|
[VM_EXEC | VM_WRITE | VM_READ] = PAGE_EXECREAD,
|
|
[VM_SHARED] = PAGE_NONE,
|
|
[VM_SHARED | VM_READ] = PAGE_READONLY,
|
|
[VM_SHARED | VM_WRITE] = PAGE_WRITEONLY,
|
|
[VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
|
|
[VM_SHARED | VM_EXEC] = PAGE_EXECREAD,
|
|
[VM_SHARED | VM_EXEC | VM_READ] = PAGE_EXECREAD,
|
|
[VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_RWX,
|
|
[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_RWX
|
|
};
|
|
DECLARE_VM_GET_PAGE_PROT
|
|
|
|
#ifdef CONFIG_EXECMEM
|
|
static struct execmem_info execmem_info __ro_after_init;
|
|
|
|
struct execmem_info __init *execmem_arch_setup(void)
|
|
{
|
|
execmem_info = (struct execmem_info){
|
|
.ranges = {
|
|
[EXECMEM_DEFAULT] = {
|
|
.start = VMALLOC_START,
|
|
.end = VMALLOC_END,
|
|
.pgprot = PAGE_KERNEL_RWX,
|
|
.alignment = 1,
|
|
},
|
|
},
|
|
};
|
|
|
|
return &execmem_info;
|
|
}
|
|
#endif /* CONFIG_EXECMEM */
|