diff options
Diffstat (limited to 'src/cpu/intel/car')
| -rw-r--r-- | src/cpu/intel/car/cache_as_ram.inc | 58 |
1 files changed, 23 insertions, 35 deletions
diff --git a/src/cpu/intel/car/cache_as_ram.inc b/src/cpu/intel/car/cache_as_ram.inc index 7cf55b3381..d208cee7d3 100644 --- a/src/cpu/intel/car/cache_as_ram.inc +++ b/src/cpu/intel/car/cache_as_ram.inc @@ -22,9 +22,6 @@ #include <cpu/x86/lapic_def.h> #include <cpu/x86/post_code.h> -#define CacheSize CONFIG_DCACHE_RAM_SIZE -#define CacheBase (0xd0000 - CacheSize) - /* Save the BIST result. */ movl %eax, %ebp @@ -128,32 +125,29 @@ clear_fixed_var_mtrr_out: */ .endm -#if CacheSize > 0x10000 +#if CONFIG_DCACHE_RAM_SIZE > 0x10000 #error Invalid CAR size, must be at most 64k. #endif -#if CacheSize < 0x1000 +#if CONFIG_DCACHE_RAM_SIZE < 0x1000 #error Invalid CAR size, must be at least 4k. This is a processor limitation. #endif -#if (CacheSize & (0x1000 - 1)) +#if (CONFIG_DCACHE_RAM_SIZE & (0x1000 - 1)) #error Invalid CAR size, is not a multiple of 4k. This is a processor limitation. #endif -#if CacheSize > 0x8000 +#if CONFIG_DCACHE_RAM_SIZE > 0x8000 /* Enable caching for 32K-64K using fixed MTRR. */ movl $MTRR_FIX_4K_C0000, %ecx - simplemask CacheSize, 0x8000 + simplemask CONFIG_DCACHE_RAM_SIZE, 0x8000 wrmsr #endif /* Enable caching for 0-32K using fixed MTRR. */ movl $MTRR_FIX_4K_C8000, %ecx - simplemask CacheSize, 0 + simplemask CONFIG_DCACHE_RAM_SIZE, 0 wrmsr - /* - * Enable write base caching so we can do execute in place (XIP) - * on the flash ROM. - */ + /* Enable cache for our code in Flash because we do XIP here. */ movl $MTRR_PHYS_BASE(1), %ecx xorl %edx, %edx /* @@ -162,7 +156,7 @@ clear_fixed_var_mtrr_out: */ movl $copy_and_run, %eax andl $(~(CONFIG_XIP_ROM_SIZE - 1)), %eax - orl $MTRR_TYPE_WRBACK, %eax + orl $MTRR_TYPE_WRPROT, %eax wrmsr movl $MTRR_PHYS_MASK(1), %ecx @@ -175,33 +169,31 @@ clear_fixed_var_mtrr_out: andl $(~(CR0_CacheDisable | CR0_NoWriteThrough)), %eax movl %eax, %cr0 - /* Read the range with lodsl. */ - movl $CacheBase, %esi + /* Read the CAR region. This will also fill up the cache. + * IMPORTANT: This step is mandatory. + */ + movl $CONFIG_DCACHE_RAM_BASE, %esi cld - movl $(CacheSize >> 2), %ecx + movl $(CONFIG_DCACHE_RAM_SIZE >> 2), %ecx rep lodsl - /* Clear the range. */ - movl $CacheBase, %edi - movl $(CacheSize >> 2), %ecx + /* Clear the CAR region. */ + movl $CONFIG_DCACHE_RAM_BASE, %edi + movl $(CONFIG_DCACHE_RAM_SIZE >> 2), %ecx xorl %eax, %eax rep stosl - movl $(CacheBase + CacheSize - 4), %eax + movl $(CONFIG_DCACHE_RAM_BASE + CONFIG_DCACHE_RAM_SIZE), %eax movl %eax, %esp lout: /* Restore the BIST result. */ movl %ebp, %eax - /* We need to set EBP? No need. */ - movl %esp, %ebp pushl %eax /* BIST */ call romstage_main - /* Save return value from romstage_main. It contains the stack to use - * after cache-as-ram is torn down. - */ - movl %eax, %ebx + /* Setup stack as indicated by return value from romstage_main(). */ + movl %eax, %esp /* We don't need CAR from now on. */ @@ -210,7 +202,7 @@ lout: orl $CR0_CacheDisable, %eax movl %eax, %cr0 - /* Clear sth. */ + /* Clear the fixed MTRR we used. */ movl $MTRR_FIX_4K_C8000, %ecx xorl %edx, %edx xorl %eax, %eax @@ -222,12 +214,12 @@ lout: #endif /* - * Set the default memory type and disable fixed - * and enable variable MTRRs. + * Enable variable and disable fixed MTRRs. + * Default memory type will be UC. */ movl $MTRR_DEF_TYPE_MSR, %ecx xorl %edx, %edx - movl $MTRR_DEF_TYPE_EN, %eax /* Enable variable and disable fixed MTRRs. */ + movl $MTRR_DEF_TYPE_EN, %eax wrmsr /* Enable cache. */ @@ -238,10 +230,6 @@ lout: __main: post_code(POST_PREPARE_RAMSTAGE) cld /* Clear direction flag. */ - - /* Setup stack as indicated by return value from romstage_main(). */ - movl %ebx, %esp - movl %esp, %ebp call copy_and_run .Lhlt: |