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/* SPDX-License-Identifier: GPL-2.0-only */
#include <cpu/x86/mtrr.h>
#include <cpu/x86/cache.h>
#include <cpu/x86/post_code.h>
#define NoEvictMod_MSR 0x2e0
#define BBL_CR_CTL3_MSR 0x11e
.section .init
.global bootblock_pre_c_entry
#include <cpu/intel/car/cache_as_ram_symbols.inc>
.code32
_cache_as_ram_setup:
bootblock_pre_c_entry:
movl $cache_as_ram, %esp /* return address */
jmp check_mtrr /* Check if CPU properly reset */
cache_as_ram:
post_code(0x20)
/* Send INIT IPI to all excluding ourself. */
movl $0x000C4500, %eax
movl $0xFEE00300, %esi
movl %eax, (%esi)
/* All CPUs need to be in Wait for SIPI state */
wait_for_sipi:
movl (%esi), %eax
bt $12, %eax
jc wait_for_sipi
post_code(0x21)
/* Clean-up MTRR_DEF_TYPE_MSR. */
movl $MTRR_DEF_TYPE_MSR, %ecx
xorl %eax, %eax
xorl %edx, %edx
wrmsr
post_code(0x22)
/* Clear/disable fixed MTRRs */
mov $fixed_mtrr_list_size, %ebx
xor %eax, %eax
xor %edx, %edx
clear_fixed_mtrr:
add $-2, %ebx
movzwl fixed_mtrr_list(%ebx), %ecx
wrmsr
jnz clear_fixed_mtrr
/* Zero out all variable range MTRRs. */
movl $MTRR_CAP_MSR, %ecx
rdmsr
andl $0xff, %eax
shl $1, %eax
movl %eax, %edi
movl $0x200, %ecx
xorl %eax, %eax
xorl %edx, %edx
clear_var_mtrrs:
wrmsr
add $1, %ecx
dec %edi
jnz clear_var_mtrrs
/* Determine CPU_ADDR_BITS and load PHYSMASK high word to %edx. */
movl $0x80000008, %eax
cpuid
movb %al, %cl
sub $32, %cl
movl $1, %edx
shl %cl, %edx
subl $1, %edx
/* Preload high word of address mask (in %edx) for Variable
* MTRRs 0 and 1.
*/
addrsize_set_high:
xorl %eax, %eax
movl $MTRR_PHYS_MASK(0), %ecx
wrmsr
movl $MTRR_PHYS_MASK(1), %ecx
wrmsr
post_code(0x23)
/* Set Cache-as-RAM base address. */
movl $(MTRR_PHYS_BASE(0)), %ecx
movl car_mtrr_start, %eax
orl $MTRR_TYPE_WRBACK, %eax
xorl %edx, %edx
wrmsr
post_code(0x24)
/* Set Cache-as-RAM mask. */
movl $(MTRR_PHYS_MASK(0)), %ecx
rdmsr
mov car_mtrr_mask, %eax
orl $MTRR_PHYS_MASK_VALID, %eax
wrmsr
/* Enable cache for our code in Flash because we do XIP here */
movl $MTRR_PHYS_BASE(1), %ecx
xorl %edx, %edx
mov rom_mtrr_base, %eax
orl $MTRR_TYPE_WRPROT, %eax
wrmsr
movl $MTRR_PHYS_MASK(1), %ecx
rdmsr
mov rom_mtrr_mask, %eax
orl $MTRR_PHYS_MASK_VALID, %eax
wrmsr
post_code(0x25)
/* Enable MTRR. */
movl $MTRR_DEF_TYPE_MSR, %ecx
rdmsr
orl $MTRR_DEF_TYPE_EN, %eax
wrmsr
#if CONFIG(CPU_HAS_L2_ENABLE_MSR)
/*
* Enable the L2 cache. Currently this assumes that this
* only affect socketed CPU's for which this is always valid,
* hence the static preprocesser.
*/
movl $BBL_CR_CTL3_MSR, %ecx
rdmsr
orl $0x100, %eax
wrmsr
#endif
/* Enable cache (CR0.CD = 0, CR0.NW = 0). */
movl %cr0, %eax
andl $(~(CR0_CacheDisable | CR0_NoWriteThrough)), %eax
invd
movl %eax, %cr0
#if CONFIG(MICROCODE_UPDATE_PRE_RAM)
update_microcode:
/* put the return address in %esp */
movl $end_microcode_update, %esp
jmp update_bsp_microcode
end_microcode_update:
#endif
/* Disable caching to change MTRR's. */
movl %cr0, %eax
orl $CR0_CacheDisable, %eax
movl %eax, %cr0
/* Clear the mask valid to disable the MTRR */
movl $MTRR_PHYS_MASK(1), %ecx
rdmsr
andl $(~MTRR_PHYS_MASK_VALID), %eax
wrmsr
/* Enable cache. */
movl %cr0, %eax
andl $(~(CR0_CacheDisable | CR0_NoWriteThrough)), %eax
invd
movl %eax, %cr0
/* enable the 'no eviction' mode */
movl $NoEvictMod_MSR, %ecx
rdmsr
orl $1, %eax
andl $~2, %eax
wrmsr
/* Clear the cache memory region. This will also fill up the cache. */
cld
xorl %eax, %eax
movl $_car_mtrr_start, %edi
movl $_car_mtrr_size, %ecx
shr $2, %ecx
rep stosl
/* enable the 'no eviction run' state */
movl $NoEvictMod_MSR, %ecx
rdmsr
orl $3, %eax
wrmsr
post_code(0x26)
/* Enable Cache-as-RAM mode by disabling cache. */
movl %cr0, %eax
orl $CR0_CacheDisable, %eax
movl %eax, %cr0
movl $MTRR_PHYS_MASK(1), %ecx
rdmsr
orl $MTRR_PHYS_MASK_VALID, %eax
wrmsr
post_code(0x28)
/* Enable cache. */
movl %cr0, %eax
andl $(~(CR0_CacheDisable | CR0_NoWriteThrough)), %eax
movl %eax, %cr0
/* 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
#if ENV_X86_64
#include <cpu/x86/64bit/entry64.inc>
movd %mm2, %rdi
shlq $32, %rdi
movd %mm1, %rsi
or %rsi, %rdi
movd %mm0, %rsi
#else
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] */
#endif
before_c_entry:
post_code(0x29)
call bootblock_c_entry_bist
/* Should never see this postcode */
post_code(POST_DEAD_CODE)
.Lhlt:
hlt
jmp .Lhlt
fixed_mtrr_list:
.word MTRR_FIX_64K_00000
.word MTRR_FIX_16K_80000
.word MTRR_FIX_16K_A0000
.word MTRR_FIX_4K_C0000
.word MTRR_FIX_4K_C8000
.word MTRR_FIX_4K_D0000
.word MTRR_FIX_4K_D8000
.word MTRR_FIX_4K_E0000
.word MTRR_FIX_4K_E8000
.word MTRR_FIX_4K_F0000
.word MTRR_FIX_4K_F8000
fixed_mtrr_list_size = . - fixed_mtrr_list
_cache_as_ram_setup_end:
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