diff options
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/via/c7/Kconfig | 6 | ||||
| -rw-r--r-- | src/cpu/via/car/cache_as_ram.S | 156 |
2 files changed, 161 insertions, 1 deletions
diff --git a/src/cpu/via/c7/Kconfig b/src/cpu/via/c7/Kconfig index df81b3f84e..b6a970b69f 100644 --- a/src/cpu/via/c7/Kconfig +++ b/src/cpu/via/c7/Kconfig @@ -14,4 +14,10 @@ if CPU_VIA_C7 config DCACHE_BSP_STACK_SIZE default 0x1000 +config DCACHE_RAM_BASE + default 0xffef0000 + +config DCACHE_RAM_SIZE + default 0x10000 + endif diff --git a/src/cpu/via/car/cache_as_ram.S b/src/cpu/via/car/cache_as_ram.S index 5c5066d7ea..9a2cec4754 100644 --- a/src/cpu/via/car/cache_as_ram.S +++ b/src/cpu/via/car/cache_as_ram.S @@ -1,13 +1,167 @@ /* SPDX-License-Identifier: GPL-2.0-only */ -.section .init, "ax", @progbits +#include <cpu/x86/mtrr.h> +#include <cpu/x86/cache.h> +#include <cpu/x86/post_code.h> +.section .init .global bootblock_pre_c_entry .code32 +_cache_as_ram_setup: + bootblock_pre_c_entry: + +cache_as_ram: + post_code(POSTCODE_BOOTBLOCK_CAR) + + /* Disable cache. */ + movl %cr0, %eax + orl $CR0_CacheDisable, %eax + movl %eax, %cr0 + invd + + /* Set the default memory type and enable fixed and variable MTRRs. */ + movl $MTRR_DEF_TYPE_MSR, %ecx + xorl %edx, %edx + movl $(MTRR_DEF_TYPE_EN | MTRR_DEF_TYPE_FIX_EN), %eax + wrmsr + + /* Clear all MTRRs. */ + xorl %edx, %edx + movl $all_mtrr_msrs, %esi + +clear_fixed_var_mtrr: + lodsl (%esi), %eax + testl %eax, %eax + jz clear_fixed_var_mtrr_out + + movl %eax, %ecx + xorl %eax, %eax + wrmsr + + jmp clear_fixed_var_mtrr + +all_mtrr_msrs: + /* fixed MTRR MSRs */ + .long MTRR_FIX_64K_00000 + .long MTRR_FIX_16K_80000 + .long MTRR_FIX_16K_A0000 + .long MTRR_FIX_4K_C0000 + .long MTRR_FIX_4K_C8000 + .long MTRR_FIX_4K_D0000 + .long MTRR_FIX_4K_D8000 + .long MTRR_FIX_4K_E0000 + .long MTRR_FIX_4K_E8000 + .long MTRR_FIX_4K_F0000 + .long MTRR_FIX_4K_F8000 + + /* var MTRR MSRs */ + .long MTRR_PHYS_BASE(0) + .long MTRR_PHYS_MASK(0) + .long MTRR_PHYS_BASE(1) + .long MTRR_PHYS_MASK(1) + .long MTRR_PHYS_BASE(2) + .long MTRR_PHYS_MASK(2) + .long MTRR_PHYS_BASE(3) + .long MTRR_PHYS_MASK(3) + .long MTRR_PHYS_BASE(4) + .long MTRR_PHYS_MASK(4) + .long MTRR_PHYS_BASE(5) + .long MTRR_PHYS_MASK(5) + .long MTRR_PHYS_BASE(6) + .long MTRR_PHYS_MASK(6) + .long MTRR_PHYS_BASE(7) + .long MTRR_PHYS_MASK(7) + + .long 0x000 /* NULL, end of table */ + +clear_fixed_var_mtrr_out: + movl $MTRR_PHYS_BASE(0), %ecx + xorl %edx, %edx + movl $_car_mtrr_start, %eax + orl $MTRR_TYPE_WRBACK, %eax + wrmsr + + movl $MTRR_PHYS_MASK(0), %ecx + /* This assumes we never access addresses above 2^36 in CAR. */ + movl $0x0000000f, %edx + movl $_car_mtrr_mask, %eax + orl $MTRR_PHYS_MASK_VALID, %eax + wrmsr + + /* + * Enable write base caching so we can do execute in place (XIP) + * on the flash ROM. + */ + movl $MTRR_PHYS_BASE(1), %ecx + xorl %edx, %edx + movl $_program, %eax + andl $_xip_mtrr_mask, %eax + orl $MTRR_TYPE_WRBACK, %eax + wrmsr + + movl $MTRR_PHYS_MASK(1), %ecx + movl $0x0000000f, %edx + movl $_xip_mtrr_mask, %eax + orl $MTRR_PHYS_MASK_VALID, %eax + wrmsr + + /* Set the default memory type and enable variable MTRRs. */ + movl $MTRR_DEF_TYPE_MSR, %ecx + xorl %edx, %edx + movl $(MTRR_DEF_TYPE_EN), %eax + wrmsr + + /* Enable cache. */ + movl %cr0, %eax + andl $(~(CR0_CacheDisable | CR0_NoWriteThrough)), %eax + movl %eax, %cr0 + + /* Read the range with lodsl. */ + cld + movl $_car_mtrr_start, %esi + movl %esi, %edi + movl $_car_mtrr_size, %ecx + shr $2, %ecx + movl %ecx, %ebx + rep lodsl + + /* Zero out the cache-as-ram area. */ + movl %ebx, %ecx + xorl %eax, %eax + rep stosl + + /* + * The key point of this CAR code is C7 cache does not turn into + * "no fill" mode, which is not compatible with general CAR code. + */ + + /* Setup the stack. */ + mov $_ecar_stack, %esp + + /* Need to align stack to 16 bytes at call instruction. Account for + the pushes below. */ + andl $0xfffffff0, %esp + subl $4, %esp + + /* push TSC and BIST to stack */ + movd %mm0, %eax + pushl %eax /* BIST */ + movd %mm2, %eax + pushl %eax /* tsc[63:32] */ + movd %mm1, %eax + pushl %eax /* tsc[31:0] */ + + /* Copy .data section content to Cache-As-Ram */ +#include <cpu/x86/copy_data_section.inc> + +before_c_entry: call bootblock_c_entry_bist + /* Should never see this postcode */ + post_code(POSTCODE_DEAD_CODE) + .Lhlt: hlt jmp .Lhlt |