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linux/arch/ia64/kernel/efi.c
Bjorn Helgaas 32e62c636a [IA64] rework memory attribute aliasing 
This closes a couple holes in our attribute aliasing avoidance scheme:

  - The current kernel fails mmaps of some /dev/mem MMIO regions because
    they don't appear in the EFI memory map.  This keeps X from working
    on the Intel Tiger box.

  - The current kernel allows UC mmap of the 0-1MB region of
    /sys/.../legacy_mem even when the chipset doesn't support UC
    access.  This causes an MCA when starting X on HP rx7620 and rx8620
    boxes in the default configuration.

There's more detail in the Documentation/ia64/aliasing.txt file this
adds, but the general idea is that if a region might be covered by
a granule-sized kernel identity mapping, any access via /dev/mem or
mmap must use the same attribute as the identity mapping.

Otherwise, we fall back to using an attribute that is supported
according to the EFI memory map, or to using UC if the EFI memory
map doesn't mention the region.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
2006-05-08 16:32:05 -07:00

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/*
* Extensible Firmware Interface
*
* Based on Extensible Firmware Interface Specification version 0.9 April 30, 1999
*
* Copyright (C) 1999 VA Linux Systems
* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
* Copyright (C) 1999-2003 Hewlett-Packard Co.
* David Mosberger-Tang <davidm@hpl.hp.com>
* Stephane Eranian <eranian@hpl.hp.com>
* (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
* Bjorn Helgaas <bjorn.helgaas@hp.com>
*
* All EFI Runtime Services are not implemented yet as EFI only
* supports physical mode addressing on SoftSDV. This is to be fixed
* in a future version. --drummond 1999-07-20
*
* Implemented EFI runtime services and virtual mode calls. --davidm
*
* Goutham Rao: <goutham.rao@intel.com>
* Skip non-WB memory and ignore empty memory ranges.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/time.h>
#include <linux/efi.h>
#include <asm/io.h>
#include <asm/kregs.h>
#include <asm/meminit.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/mca.h>
#define EFI_DEBUG 0
extern efi_status_t efi_call_phys (void *, ...);
struct efi efi;
EXPORT_SYMBOL(efi);
static efi_runtime_services_t *runtime;
static unsigned long mem_limit = ~0UL, max_addr = ~0UL;
#define efi_call_virt(f, args...) (*(f))(args)
#define STUB_GET_TIME(prefix, adjust_arg) \
static efi_status_t \
prefix##_get_time (efi_time_t *tm, efi_time_cap_t *tc) \
{ \
struct ia64_fpreg fr[6]; \
efi_time_cap_t *atc = NULL; \
efi_status_t ret; \
\
if (tc) \
atc = adjust_arg(tc); \
ia64_save_scratch_fpregs(fr); \
ret = efi_call_##prefix((efi_get_time_t *) __va(runtime->get_time), adjust_arg(tm), atc); \
ia64_load_scratch_fpregs(fr); \
return ret; \
}
#define STUB_SET_TIME(prefix, adjust_arg) \
static efi_status_t \
prefix##_set_time (efi_time_t *tm) \
{ \
struct ia64_fpreg fr[6]; \
efi_status_t ret; \
\
ia64_save_scratch_fpregs(fr); \
ret = efi_call_##prefix((efi_set_time_t *) __va(runtime->set_time), adjust_arg(tm)); \
ia64_load_scratch_fpregs(fr); \
return ret; \
}
#define STUB_GET_WAKEUP_TIME(prefix, adjust_arg) \
static efi_status_t \
prefix##_get_wakeup_time (efi_bool_t *enabled, efi_bool_t *pending, efi_time_t *tm) \
{ \
struct ia64_fpreg fr[6]; \
efi_status_t ret; \
\
ia64_save_scratch_fpregs(fr); \
ret = efi_call_##prefix((efi_get_wakeup_time_t *) __va(runtime->get_wakeup_time), \
adjust_arg(enabled), adjust_arg(pending), adjust_arg(tm)); \
ia64_load_scratch_fpregs(fr); \
return ret; \
}
#define STUB_SET_WAKEUP_TIME(prefix, adjust_arg) \
static efi_status_t \
prefix##_set_wakeup_time (efi_bool_t enabled, efi_time_t *tm) \
{ \
struct ia64_fpreg fr[6]; \
efi_time_t *atm = NULL; \
efi_status_t ret; \
\
if (tm) \
atm = adjust_arg(tm); \
ia64_save_scratch_fpregs(fr); \
ret = efi_call_##prefix((efi_set_wakeup_time_t *) __va(runtime->set_wakeup_time), \
enabled, atm); \
ia64_load_scratch_fpregs(fr); \
return ret; \
}
#define STUB_GET_VARIABLE(prefix, adjust_arg) \
static efi_status_t \
prefix##_get_variable (efi_char16_t *name, efi_guid_t *vendor, u32 *attr, \
unsigned long *data_size, void *data) \
{ \
struct ia64_fpreg fr[6]; \
u32 *aattr = NULL; \
efi_status_t ret; \
\
if (attr) \
aattr = adjust_arg(attr); \
ia64_save_scratch_fpregs(fr); \
ret = efi_call_##prefix((efi_get_variable_t *) __va(runtime->get_variable), \
adjust_arg(name), adjust_arg(vendor), aattr, \
adjust_arg(data_size), adjust_arg(data)); \
ia64_load_scratch_fpregs(fr); \
return ret; \
}
#define STUB_GET_NEXT_VARIABLE(prefix, adjust_arg) \
static efi_status_t \
prefix##_get_next_variable (unsigned long *name_size, efi_char16_t *name, efi_guid_t *vendor) \
{ \
struct ia64_fpreg fr[6]; \
efi_status_t ret; \
\
ia64_save_scratch_fpregs(fr); \
ret = efi_call_##prefix((efi_get_next_variable_t *) __va(runtime->get_next_variable), \
adjust_arg(name_size), adjust_arg(name), adjust_arg(vendor)); \
ia64_load_scratch_fpregs(fr); \
return ret; \
}
#define STUB_SET_VARIABLE(prefix, adjust_arg) \
static efi_status_t \
prefix##_set_variable (efi_char16_t *name, efi_guid_t *vendor, unsigned long attr, \
unsigned long data_size, void *data) \
{ \
struct ia64_fpreg fr[6]; \
efi_status_t ret; \
\
ia64_save_scratch_fpregs(fr); \
ret = efi_call_##prefix((efi_set_variable_t *) __va(runtime->set_variable), \
adjust_arg(name), adjust_arg(vendor), attr, data_size, \
adjust_arg(data)); \
ia64_load_scratch_fpregs(fr); \
return ret; \
}
#define STUB_GET_NEXT_HIGH_MONO_COUNT(prefix, adjust_arg) \
static efi_status_t \
prefix##_get_next_high_mono_count (u32 *count) \
{ \
struct ia64_fpreg fr[6]; \
efi_status_t ret; \
\
ia64_save_scratch_fpregs(fr); \
ret = efi_call_##prefix((efi_get_next_high_mono_count_t *) \
__va(runtime->get_next_high_mono_count), adjust_arg(count)); \
ia64_load_scratch_fpregs(fr); \
return ret; \
}
#define STUB_RESET_SYSTEM(prefix, adjust_arg) \
static void \
prefix##_reset_system (int reset_type, efi_status_t status, \
unsigned long data_size, efi_char16_t *data) \
{ \
struct ia64_fpreg fr[6]; \
efi_char16_t *adata = NULL; \
\
if (data) \
adata = adjust_arg(data); \
\
ia64_save_scratch_fpregs(fr); \
efi_call_##prefix((efi_reset_system_t *) __va(runtime->reset_system), \
reset_type, status, data_size, adata); \
/* should not return, but just in case... */ \
ia64_load_scratch_fpregs(fr); \
}
#define phys_ptr(arg) ((__typeof__(arg)) ia64_tpa(arg))
STUB_GET_TIME(phys, phys_ptr)
STUB_SET_TIME(phys, phys_ptr)
STUB_GET_WAKEUP_TIME(phys, phys_ptr)
STUB_SET_WAKEUP_TIME(phys, phys_ptr)
STUB_GET_VARIABLE(phys, phys_ptr)
STUB_GET_NEXT_VARIABLE(phys, phys_ptr)
STUB_SET_VARIABLE(phys, phys_ptr)
STUB_GET_NEXT_HIGH_MONO_COUNT(phys, phys_ptr)
STUB_RESET_SYSTEM(phys, phys_ptr)
#define id(arg) arg
STUB_GET_TIME(virt, id)
STUB_SET_TIME(virt, id)
STUB_GET_WAKEUP_TIME(virt, id)
STUB_SET_WAKEUP_TIME(virt, id)
STUB_GET_VARIABLE(virt, id)
STUB_GET_NEXT_VARIABLE(virt, id)
STUB_SET_VARIABLE(virt, id)
STUB_GET_NEXT_HIGH_MONO_COUNT(virt, id)
STUB_RESET_SYSTEM(virt, id)
void
efi_gettimeofday (struct timespec *ts)
{
efi_time_t tm;
memset(ts, 0, sizeof(ts));
if ((*efi.get_time)(&tm, NULL) != EFI_SUCCESS)
return;
ts->tv_sec = mktime(tm.year, tm.month, tm.day, tm.hour, tm.minute, tm.second);
ts->tv_nsec = tm.nanosecond;
}
static int
is_available_memory (efi_memory_desc_t *md)
{
if (!(md->attribute & EFI_MEMORY_WB))
return 0;
switch (md->type) {
case EFI_LOADER_CODE:
case EFI_LOADER_DATA:
case EFI_BOOT_SERVICES_CODE:
case EFI_BOOT_SERVICES_DATA:
case EFI_CONVENTIONAL_MEMORY:
return 1;
}
return 0;
}
typedef struct kern_memdesc {
u64 attribute;
u64 start;
u64 num_pages;
} kern_memdesc_t;
static kern_memdesc_t *kern_memmap;
#define efi_md_size(md) (md->num_pages << EFI_PAGE_SHIFT)
static inline u64
kmd_end(kern_memdesc_t *kmd)
{
return (kmd->start + (kmd->num_pages << EFI_PAGE_SHIFT));
}
static inline u64
efi_md_end(efi_memory_desc_t *md)
{
return (md->phys_addr + efi_md_size(md));
}
static inline int
efi_wb(efi_memory_desc_t *md)
{
return (md->attribute & EFI_MEMORY_WB);
}
static inline int
efi_uc(efi_memory_desc_t *md)
{
return (md->attribute & EFI_MEMORY_UC);
}
static void
walk (efi_freemem_callback_t callback, void *arg, u64 attr)
{
kern_memdesc_t *k;
u64 start, end, voff;
voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
for (k = kern_memmap; k->start != ~0UL; k++) {
if (k->attribute != attr)
continue;
start = PAGE_ALIGN(k->start);
end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
if (start < end)
if ((*callback)(start + voff, end + voff, arg) < 0)
return;
}
}
/*
* Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
* has memory that is available for OS use.
*/
void
efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
{
walk(callback, arg, EFI_MEMORY_WB);
}
/*
* Walks the EFI memory map and calls CALLBACK once for each EFI memory descriptor that
* has memory that is available for uncached allocator.
*/
void
efi_memmap_walk_uc (efi_freemem_callback_t callback, void *arg)
{
walk(callback, arg, EFI_MEMORY_UC);
}
/*
* Look for the PAL_CODE region reported by EFI and maps it using an
* ITR to enable safe PAL calls in virtual mode. See IA-64 Processor
* Abstraction Layer chapter 11 in ADAG
*/
void *
efi_get_pal_addr (void)
{
void *efi_map_start, *efi_map_end, *p;
efi_memory_desc_t *md;
u64 efi_desc_size;
int pal_code_count = 0;
u64 vaddr, mask;
efi_map_start = __va(ia64_boot_param->efi_memmap);
efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
efi_desc_size = ia64_boot_param->efi_memdesc_size;
for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
md = p;
if (md->type != EFI_PAL_CODE)
continue;
if (++pal_code_count > 1) {
printk(KERN_ERR "Too many EFI Pal Code memory ranges, dropped @ %lx\n",
md->phys_addr);
continue;
}
/*
* The only ITLB entry in region 7 that is used is the one installed by
* __start(). That entry covers a 64MB range.
*/
mask = ~((1 << KERNEL_TR_PAGE_SHIFT) - 1);
vaddr = PAGE_OFFSET + md->phys_addr;
/*
* We must check that the PAL mapping won't overlap with the kernel
* mapping.
*
* PAL code is guaranteed to be aligned on a power of 2 between 4k and
* 256KB and that only one ITR is needed to map it. This implies that the
* PAL code is always aligned on its size, i.e., the closest matching page
* size supported by the TLB. Therefore PAL code is guaranteed never to
* cross a 64MB unless it is bigger than 64MB (very unlikely!). So for
* now the following test is enough to determine whether or not we need a
* dedicated ITR for the PAL code.
*/
if ((vaddr & mask) == (KERNEL_START & mask)) {
printk(KERN_INFO "%s: no need to install ITR for PAL code\n",
__FUNCTION__);
continue;
}
if (md->num_pages << EFI_PAGE_SHIFT > IA64_GRANULE_SIZE)
panic("Woah! PAL code size bigger than a granule!");
#if EFI_DEBUG
mask = ~((1 << IA64_GRANULE_SHIFT) - 1);
printk(KERN_INFO "CPU %d: mapping PAL code [0x%lx-0x%lx) into [0x%lx-0x%lx)\n",
smp_processor_id(), md->phys_addr,
md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
vaddr & mask, (vaddr & mask) + IA64_GRANULE_SIZE);
#endif
return __va(md->phys_addr);
}
printk(KERN_WARNING "%s: no PAL-code memory-descriptor found",
__FUNCTION__);
return NULL;
}
void
efi_map_pal_code (void)
{
void *pal_vaddr = efi_get_pal_addr ();
u64 psr;
if (!pal_vaddr)
return;
/*
* Cannot write to CRx with PSR.ic=1
*/
psr = ia64_clear_ic();
ia64_itr(0x1, IA64_TR_PALCODE, GRANULEROUNDDOWN((unsigned long) pal_vaddr),
pte_val(pfn_pte(__pa(pal_vaddr) >> PAGE_SHIFT, PAGE_KERNEL)),
IA64_GRANULE_SHIFT);
ia64_set_psr(psr); /* restore psr */
ia64_srlz_i();
}
void __init
efi_init (void)
{
void *efi_map_start, *efi_map_end;
efi_config_table_t *config_tables;
efi_char16_t *c16;
u64 efi_desc_size;
char *cp, vendor[100] = "unknown";
extern char saved_command_line[];
int i;
/* it's too early to be able to use the standard kernel command line support... */
for (cp = saved_command_line; *cp; ) {
if (memcmp(cp, "mem=", 4) == 0) {
mem_limit = memparse(cp + 4, &cp);
} else if (memcmp(cp, "max_addr=", 9) == 0) {
max_addr = GRANULEROUNDDOWN(memparse(cp + 9, &cp));
} else {
while (*cp != ' ' && *cp)
++cp;
while (*cp == ' ')
++cp;
}
}
if (max_addr != ~0UL)
printk(KERN_INFO "Ignoring memory above %luMB\n", max_addr >> 20);
efi.systab = __va(ia64_boot_param->efi_systab);
/*
* Verify the EFI Table
*/
if (efi.systab == NULL)
panic("Woah! Can't find EFI system table.\n");
if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
panic("Woah! EFI system table signature incorrect\n");
if ((efi.systab->hdr.revision ^ EFI_SYSTEM_TABLE_REVISION) >> 16 != 0)
printk(KERN_WARNING "Warning: EFI system table major version mismatch: "
"got %d.%02d, expected %d.%02d\n",
efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff,
EFI_SYSTEM_TABLE_REVISION >> 16, EFI_SYSTEM_TABLE_REVISION & 0xffff);
config_tables = __va(efi.systab->tables);
/* Show what we know for posterity */
c16 = __va(efi.systab->fw_vendor);
if (c16) {
for (i = 0;i < (int) sizeof(vendor) - 1 && *c16; ++i)
vendor[i] = *c16++;
vendor[i] = '\0';
}
printk(KERN_INFO "EFI v%u.%.02u by %s:",
efi.systab->hdr.revision >> 16, efi.systab->hdr.revision & 0xffff, vendor);
efi.mps = EFI_INVALID_TABLE_ADDR;
efi.acpi = EFI_INVALID_TABLE_ADDR;
efi.acpi20 = EFI_INVALID_TABLE_ADDR;
efi.smbios = EFI_INVALID_TABLE_ADDR;
efi.sal_systab = EFI_INVALID_TABLE_ADDR;
efi.boot_info = EFI_INVALID_TABLE_ADDR;
efi.hcdp = EFI_INVALID_TABLE_ADDR;
efi.uga = EFI_INVALID_TABLE_ADDR;
for (i = 0; i < (int) efi.systab->nr_tables; i++) {
if (efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID) == 0) {
efi.mps = config_tables[i].table;
printk(" MPS=0x%lx", config_tables[i].table);
} else if (efi_guidcmp(config_tables[i].guid, ACPI_20_TABLE_GUID) == 0) {
efi.acpi20 = config_tables[i].table;
printk(" ACPI 2.0=0x%lx", config_tables[i].table);
} else if (efi_guidcmp(config_tables[i].guid, ACPI_TABLE_GUID) == 0) {
efi.acpi = config_tables[i].table;
printk(" ACPI=0x%lx", config_tables[i].table);
} else if (efi_guidcmp(config_tables[i].guid, SMBIOS_TABLE_GUID) == 0) {
efi.smbios = config_tables[i].table;
printk(" SMBIOS=0x%lx", config_tables[i].table);
} else if (efi_guidcmp(config_tables[i].guid, SAL_SYSTEM_TABLE_GUID) == 0) {
efi.sal_systab = config_tables[i].table;
printk(" SALsystab=0x%lx", config_tables[i].table);
} else if (efi_guidcmp(config_tables[i].guid, HCDP_TABLE_GUID) == 0) {
efi.hcdp = config_tables[i].table;
printk(" HCDP=0x%lx", config_tables[i].table);
}
}
printk("\n");
runtime = __va(efi.systab->runtime);
efi.get_time = phys_get_time;
efi.set_time = phys_set_time;
efi.get_wakeup_time = phys_get_wakeup_time;
efi.set_wakeup_time = phys_set_wakeup_time;
efi.get_variable = phys_get_variable;
efi.get_next_variable = phys_get_next_variable;
efi.set_variable = phys_set_variable;
efi.get_next_high_mono_count = phys_get_next_high_mono_count;
efi.reset_system = phys_reset_system;
efi_map_start = __va(ia64_boot_param->efi_memmap);
efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
efi_desc_size = ia64_boot_param->efi_memdesc_size;
#if EFI_DEBUG
/* print EFI memory map: */
{
efi_memory_desc_t *md;
void *p;
for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
md = p;
printk("mem%02u: type=%u, attr=0x%lx, range=[0x%016lx-0x%016lx) (%luMB)\n",
i, md->type, md->attribute, md->phys_addr,
md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
md->num_pages >> (20 - EFI_PAGE_SHIFT));
}
}
#endif
efi_map_pal_code();
efi_enter_virtual_mode();
}
void
efi_enter_virtual_mode (void)
{
void *efi_map_start, *efi_map_end, *p;
efi_memory_desc_t *md;
efi_status_t status;
u64 efi_desc_size;
efi_map_start = __va(ia64_boot_param->efi_memmap);
efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
efi_desc_size = ia64_boot_param->efi_memdesc_size;
for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
md = p;
if (md->attribute & EFI_MEMORY_RUNTIME) {
/*
* Some descriptors have multiple bits set, so the order of
* the tests is relevant.
*/
if (md->attribute & EFI_MEMORY_WB) {
md->virt_addr = (u64) __va(md->phys_addr);
} else if (md->attribute & EFI_MEMORY_UC) {
md->virt_addr = (u64) ioremap(md->phys_addr, 0);
} else if (md->attribute & EFI_MEMORY_WC) {
#if 0
md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
| _PAGE_D
| _PAGE_MA_WC
| _PAGE_PL_0
| _PAGE_AR_RW));
#else
printk(KERN_INFO "EFI_MEMORY_WC mapping\n");
md->virt_addr = (u64) ioremap(md->phys_addr, 0);
#endif
} else if (md->attribute & EFI_MEMORY_WT) {
#if 0
md->virt_addr = ia64_remap(md->phys_addr, (_PAGE_A | _PAGE_P
| _PAGE_D | _PAGE_MA_WT
| _PAGE_PL_0
| _PAGE_AR_RW));
#else
printk(KERN_INFO "EFI_MEMORY_WT mapping\n");
md->virt_addr = (u64) ioremap(md->phys_addr, 0);
#endif
}
}
}
status = efi_call_phys(__va(runtime->set_virtual_address_map),
ia64_boot_param->efi_memmap_size,
efi_desc_size, ia64_boot_param->efi_memdesc_version,
ia64_boot_param->efi_memmap);
if (status != EFI_SUCCESS) {
printk(KERN_WARNING "warning: unable to switch EFI into virtual mode "
"(status=%lu)\n", status);
return;
}
/*
* Now that EFI is in virtual mode, we call the EFI functions more efficiently:
*/
efi.get_time = virt_get_time;
efi.set_time = virt_set_time;
efi.get_wakeup_time = virt_get_wakeup_time;
efi.set_wakeup_time = virt_set_wakeup_time;
efi.get_variable = virt_get_variable;
efi.get_next_variable = virt_get_next_variable;
efi.set_variable = virt_set_variable;
efi.get_next_high_mono_count = virt_get_next_high_mono_count;
efi.reset_system = virt_reset_system;
}
/*
* Walk the EFI memory map looking for the I/O port range. There can only be one entry of
* this type, other I/O port ranges should be described via ACPI.
*/
u64
efi_get_iobase (void)
{
void *efi_map_start, *efi_map_end, *p;
efi_memory_desc_t *md;
u64 efi_desc_size;
efi_map_start = __va(ia64_boot_param->efi_memmap);
efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
efi_desc_size = ia64_boot_param->efi_memdesc_size;
for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
md = p;
if (md->type == EFI_MEMORY_MAPPED_IO_PORT_SPACE) {
if (md->attribute & EFI_MEMORY_UC)
return md->phys_addr;
}
}
return 0;
}
static struct kern_memdesc *
kern_memory_descriptor (unsigned long phys_addr)
{
struct kern_memdesc *md;
for (md = kern_memmap; md->start != ~0UL; md++) {
if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
return md;
}
return 0;
}
static efi_memory_desc_t *
efi_memory_descriptor (unsigned long phys_addr)
{
void *efi_map_start, *efi_map_end, *p;
efi_memory_desc_t *md;
u64 efi_desc_size;
efi_map_start = __va(ia64_boot_param->efi_memmap);
efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
efi_desc_size = ia64_boot_param->efi_memdesc_size;
for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
md = p;
if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
return md;
}
return 0;
}
u32
efi_mem_type (unsigned long phys_addr)
{
efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
if (md)
return md->type;
return 0;
}
u64
efi_mem_attributes (unsigned long phys_addr)
{
efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
if (md)
return md->attribute;
return 0;
}
EXPORT_SYMBOL(efi_mem_attributes);
u64
efi_mem_attribute (unsigned long phys_addr, unsigned long size)
{
unsigned long end = phys_addr + size;
efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
u64 attr;
if (!md)
return 0;
/*
* EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
* the kernel that firmware needs this region mapped.
*/
attr = md->attribute & ~EFI_MEMORY_RUNTIME;
do {
unsigned long md_end = efi_md_end(md);
if (end <= md_end)
return attr;
md = efi_memory_descriptor(md_end);
if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
return 0;
} while (md);
return 0;
}
u64
kern_mem_attribute (unsigned long phys_addr, unsigned long size)
{
unsigned long end = phys_addr + size;
struct kern_memdesc *md;
u64 attr;
/*
* This is a hack for ioremap calls before we set up kern_memmap.
* Maybe we should do efi_memmap_init() earlier instead.
*/
if (!kern_memmap) {
attr = efi_mem_attribute(phys_addr, size);
if (attr & EFI_MEMORY_WB)
return EFI_MEMORY_WB;
return 0;
}
md = kern_memory_descriptor(phys_addr);
if (!md)
return 0;
attr = md->attribute;
do {
unsigned long md_end = kmd_end(md);
if (end <= md_end)
return attr;
md = kern_memory_descriptor(md_end);
if (!md || md->attribute != attr)
return 0;
} while (md);
return 0;
}
EXPORT_SYMBOL(kern_mem_attribute);
int
valid_phys_addr_range (unsigned long phys_addr, unsigned long size)
{
u64 attr;
/*
* /dev/mem reads and writes use copy_to_user(), which implicitly
* uses a granule-sized kernel identity mapping. It's really
* only safe to do this for regions in kern_memmap. For more
* details, see Documentation/ia64/aliasing.txt.
*/
attr = kern_mem_attribute(phys_addr, size);
if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
return 1;
return 0;
}
int
valid_mmap_phys_addr_range (unsigned long phys_addr, unsigned long size)
{
/*
* MMIO regions are often missing from the EFI memory map.
* We must allow mmap of them for programs like X, so we
* currently can't do any useful validation.
*/
return 1;
}
pgprot_t
phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
pgprot_t vma_prot)
{
unsigned long phys_addr = pfn << PAGE_SHIFT;
u64 attr;
/*
* For /dev/mem mmap, we use user mappings, but if the region is
* in kern_memmap (and hence may be covered by a kernel mapping),
* we must use the same attribute as the kernel mapping.
*/
attr = kern_mem_attribute(phys_addr, size);
if (attr & EFI_MEMORY_WB)
return pgprot_cacheable(vma_prot);
else if (attr & EFI_MEMORY_UC)
return pgprot_noncached(vma_prot);
/*
* Some chipsets don't support UC access to memory. If
* WB is supported, we prefer that.
*/
if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
return pgprot_cacheable(vma_prot);
return pgprot_noncached(vma_prot);
}
int __init
efi_uart_console_only(void)
{
efi_status_t status;
char *s, name[] = "ConOut";
efi_guid_t guid = EFI_GLOBAL_VARIABLE_GUID;
efi_char16_t *utf16, name_utf16[32];
unsigned char data[1024];
unsigned long size = sizeof(data);
struct efi_generic_dev_path *hdr, *end_addr;
int uart = 0;
/* Convert to UTF-16 */
utf16 = name_utf16;
s = name;
while (*s)
*utf16++ = *s++ & 0x7f;
*utf16 = 0;
status = efi.get_variable(name_utf16, &guid, NULL, &size, data);
if (status != EFI_SUCCESS) {
printk(KERN_ERR "No EFI %s variable?\n", name);
return 0;
}
hdr = (struct efi_generic_dev_path *) data;
end_addr = (struct efi_generic_dev_path *) ((u8 *) data + size);
while (hdr < end_addr) {
if (hdr->type == EFI_DEV_MSG &&
hdr->sub_type == EFI_DEV_MSG_UART)
uart = 1;
else if (hdr->type == EFI_DEV_END_PATH ||
hdr->type == EFI_DEV_END_PATH2) {
if (!uart)
return 0;
if (hdr->sub_type == EFI_DEV_END_ENTIRE)
return 1;
uart = 0;
}
hdr = (struct efi_generic_dev_path *) ((u8 *) hdr + hdr->length);
}
printk(KERN_ERR "Malformed %s value\n", name);
return 0;
}
/*
* Look for the first granule aligned memory descriptor memory
* that is big enough to hold EFI memory map. Make sure this
* descriptor is atleast granule sized so it does not get trimmed
*/
struct kern_memdesc *
find_memmap_space (void)
{
u64 contig_low=0, contig_high=0;
u64 as = 0, ae;
void *efi_map_start, *efi_map_end, *p, *q;
efi_memory_desc_t *md, *pmd = NULL, *check_md;
u64 space_needed, efi_desc_size;
unsigned long total_mem = 0;
efi_map_start = __va(ia64_boot_param->efi_memmap);
efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
efi_desc_size = ia64_boot_param->efi_memdesc_size;
/*
* Worst case: we need 3 kernel descriptors for each efi descriptor
* (if every entry has a WB part in the middle, and UC head and tail),
* plus one for the end marker.
*/
space_needed = sizeof(kern_memdesc_t) *
(3 * (ia64_boot_param->efi_memmap_size/efi_desc_size) + 1);
for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
md = p;
if (!efi_wb(md)) {
continue;
}
if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
contig_low = GRANULEROUNDUP(md->phys_addr);
contig_high = efi_md_end(md);
for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
check_md = q;
if (!efi_wb(check_md))
break;
if (contig_high != check_md->phys_addr)
break;
contig_high = efi_md_end(check_md);
}
contig_high = GRANULEROUNDDOWN(contig_high);
}
if (!is_available_memory(md) || md->type == EFI_LOADER_DATA)
continue;
/* Round ends inward to granule boundaries */
as = max(contig_low, md->phys_addr);
ae = min(contig_high, efi_md_end(md));
/* keep within max_addr= command line arg */
ae = min(ae, max_addr);
if (ae <= as)
continue;
/* avoid going over mem= command line arg */
if (total_mem + (ae - as) > mem_limit)
ae -= total_mem + (ae - as) - mem_limit;
if (ae <= as)
continue;
if (ae - as > space_needed)
break;
}
if (p >= efi_map_end)
panic("Can't allocate space for kernel memory descriptors");
return __va(as);
}
/*
* Walk the EFI memory map and gather all memory available for kernel
* to use. We can allocate partial granules only if the unavailable
* parts exist, and are WB.
*/
void
efi_memmap_init(unsigned long *s, unsigned long *e)
{
struct kern_memdesc *k, *prev = 0;
u64 contig_low=0, contig_high=0;
u64 as, ae, lim;
void *efi_map_start, *efi_map_end, *p, *q;
efi_memory_desc_t *md, *pmd = NULL, *check_md;
u64 efi_desc_size;
unsigned long total_mem = 0;
k = kern_memmap = find_memmap_space();
efi_map_start = __va(ia64_boot_param->efi_memmap);
efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
efi_desc_size = ia64_boot_param->efi_memdesc_size;
for (p = efi_map_start; p < efi_map_end; pmd = md, p += efi_desc_size) {
md = p;
if (!efi_wb(md)) {
if (efi_uc(md) && (md->type == EFI_CONVENTIONAL_MEMORY ||
md->type == EFI_BOOT_SERVICES_DATA)) {
k->attribute = EFI_MEMORY_UC;
k->start = md->phys_addr;
k->num_pages = md->num_pages;
k++;
}
continue;
}
if (pmd == NULL || !efi_wb(pmd) || efi_md_end(pmd) != md->phys_addr) {
contig_low = GRANULEROUNDUP(md->phys_addr);
contig_high = efi_md_end(md);
for (q = p + efi_desc_size; q < efi_map_end; q += efi_desc_size) {
check_md = q;
if (!efi_wb(check_md))
break;
if (contig_high != check_md->phys_addr)
break;
contig_high = efi_md_end(check_md);
}
contig_high = GRANULEROUNDDOWN(contig_high);
}
if (!is_available_memory(md))
continue;
/*
* Round ends inward to granule boundaries
* Give trimmings to uncached allocator
*/
if (md->phys_addr < contig_low) {
lim = min(efi_md_end(md), contig_low);
if (efi_uc(md)) {
if (k > kern_memmap && (k-1)->attribute == EFI_MEMORY_UC &&
kmd_end(k-1) == md->phys_addr) {
(k-1)->num_pages += (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
} else {
k->attribute = EFI_MEMORY_UC;
k->start = md->phys_addr;
k->num_pages = (lim - md->phys_addr) >> EFI_PAGE_SHIFT;
k++;
}
}
as = contig_low;
} else
as = md->phys_addr;
if (efi_md_end(md) > contig_high) {
lim = max(md->phys_addr, contig_high);
if (efi_uc(md)) {
if (lim == md->phys_addr && k > kern_memmap &&
(k-1)->attribute == EFI_MEMORY_UC &&
kmd_end(k-1) == md->phys_addr) {
(k-1)->num_pages += md->num_pages;
} else {
k->attribute = EFI_MEMORY_UC;
k->start = lim;
k->num_pages = (efi_md_end(md) - lim) >> EFI_PAGE_SHIFT;
k++;
}
}
ae = contig_high;
} else
ae = efi_md_end(md);
/* keep within max_addr= command line arg */
ae = min(ae, max_addr);
if (ae <= as)
continue;
/* avoid going over mem= command line arg */
if (total_mem + (ae - as) > mem_limit)
ae -= total_mem + (ae - as) - mem_limit;
if (ae <= as)
continue;
if (prev && kmd_end(prev) == md->phys_addr) {
prev->num_pages += (ae - as) >> EFI_PAGE_SHIFT;
total_mem += ae - as;
continue;
}
k->attribute = EFI_MEMORY_WB;
k->start = as;
k->num_pages = (ae - as) >> EFI_PAGE_SHIFT;
total_mem += ae - as;
prev = k++;
}
k->start = ~0L; /* end-marker */
/* reserve the memory we are using for kern_memmap */
*s = (u64)kern_memmap;
*e = (u64)++k;
}
void
efi_initialize_iomem_resources(struct resource *code_resource,
struct resource *data_resource)
{
struct resource *res;
void *efi_map_start, *efi_map_end, *p;
efi_memory_desc_t *md;
u64 efi_desc_size;
char *name;
unsigned long flags;
efi_map_start = __va(ia64_boot_param->efi_memmap);
efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
efi_desc_size = ia64_boot_param->efi_memdesc_size;
res = NULL;
for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
md = p;
if (md->num_pages == 0) /* should not happen */
continue;
flags = IORESOURCE_MEM;
switch (md->type) {
case EFI_MEMORY_MAPPED_IO:
case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
continue;
case EFI_LOADER_CODE:
case EFI_LOADER_DATA:
case EFI_BOOT_SERVICES_DATA:
case EFI_BOOT_SERVICES_CODE:
case EFI_CONVENTIONAL_MEMORY:
if (md->attribute & EFI_MEMORY_WP) {
name = "System ROM";
flags |= IORESOURCE_READONLY;
} else {
name = "System RAM";
}
break;
case EFI_ACPI_MEMORY_NVS:
name = "ACPI Non-volatile Storage";
flags |= IORESOURCE_BUSY;
break;
case EFI_UNUSABLE_MEMORY:
name = "reserved";
flags |= IORESOURCE_BUSY | IORESOURCE_DISABLED;
break;
case EFI_RESERVED_TYPE:
case EFI_RUNTIME_SERVICES_CODE:
case EFI_RUNTIME_SERVICES_DATA:
case EFI_ACPI_RECLAIM_MEMORY:
default:
name = "reserved";
flags |= IORESOURCE_BUSY;
break;
}
if ((res = kzalloc(sizeof(struct resource), GFP_KERNEL)) == NULL) {
printk(KERN_ERR "failed to alocate resource for iomem\n");
return;
}
res->name = name;
res->start = md->phys_addr;
res->end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
res->flags = flags;
if (insert_resource(&iomem_resource, res) < 0)
kfree(res);
else {
/*
* We don't know which region contains
* kernel data so we try it repeatedly and
* let the resource manager test it.
*/
insert_resource(res, code_resource);
insert_resource(res, data_resource);
}
}
}
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