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Detect cache type on runtime rather than compile time

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2013-05-17 01:33:22 +02:00
parent c59fe1d776
commit 390df92f0b
5 changed files with 238 additions and 148 deletions
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72
grub-core/kern/arm/cache.c Normal file
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@ -0,0 +1,72 @@
#include <grub/dl.h>
#include <grub/cache.h>
#include <grub/arm/system.h>
static enum
{
ARCH_UNKNOWN,
ARCH_ARMV6,
ARCH_ARMV7
} type = ARCH_UNKNOWN;
grub_uint32_t grub_arch_cache_dlinesz;
grub_uint32_t grub_arch_cache_ilinesz;
/* Prototypes for asm functions. */
void grub_arch_sync_caches_armv6 (void *address, grub_size_t len);
void grub_arch_sync_caches_armv7 (void *address, grub_size_t len);
void grub_arm_disable_caches_mmu_armv6 (void);
void grub_arm_disable_caches_mmu_armv7 (void);
static void
probe_caches (void)
{
grub_uint32_t main_id, cache_type;
/* Read Cache Type Register */
asm volatile ("mrc p15, 0, %0, c0, c0, 0": "=r"(main_id));
if (((main_id >> 12) & 0xf) == 0x0 || ((main_id >> 12) & 0xf) == 0x7
|| (((main_id >> 16) & 0x7) != 0x7))
grub_fatal ("Unsupported ARM ID 0x%x", main_id);
/* Read Cache Type Register */
asm volatile ("mrc p15, 0, %0, c0, c0, 1": "=r"(cache_type));
switch (cache_type >> 29)
{
case 0:
grub_arch_cache_dlinesz = 8 << ((cache_type >> 12) & 3);
grub_arch_cache_ilinesz = 8 << (cache_type & 3);
type = ARCH_ARMV6;
break;
case 4:
grub_arch_cache_dlinesz = 4 << ((cache_type >> 16) & 0xf);
grub_arch_cache_ilinesz = 4 << (cache_type & 0xf);
type = ARCH_ARMV7;
default:
grub_fatal ("Unsupported cache type 0x%x", cache_type);
}
}
void
grub_arch_sync_caches (void *address, grub_size_t len)
{
if (type == ARCH_UNKNOWN)
probe_caches ();
if (type == ARCH_ARMV6)
grub_arch_sync_caches_armv6 (address, len);
if (type == ARCH_ARMV7)
grub_arch_sync_caches_armv7 (address, len);
}
void
grub_arm_disable_caches_mmu (void)
{
if (type == ARCH_UNKNOWN)
probe_caches ();
if (type == ARCH_ARMV6)
grub_arm_disable_caches_mmu_armv6 ();
if (type == ARCH_ARMV7)
grub_arm_disable_caches_mmu_armv7 ();
}