Add support for CAR so that we have memory to use prior to DRAM init. On link there is a total of 128KB of CAR available, although some is used for the memory reference code.
Signed-off-by: Simon Glass sjg@chromium.org ---
Changes in v2: - Expand the comment about preserving ebp - Move SIPI code to after CAR init - Use capitals for all #define declarations
arch/x86/Kconfig | 16 ++++ arch/x86/cpu/ivybridge/car.S | 162 ++++++++++++++++++++++++++++++++++- arch/x86/cpu/ivybridge/cpu.c | 2 + arch/x86/include/asm/mtrr.h | 121 ++++++++++++++++++++++++++ arch/x86/include/asm/post.h | 13 ++- board/google/chromebook_link/Kconfig | 12 +++ 6 files changed, 323 insertions(+), 3 deletions(-) create mode 100644 arch/x86/include/asm/mtrr.h
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 580d6a4..995ffa6 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -34,6 +34,22 @@ config TARGET_CHROMEBOOK_LINK
endchoice
+config RAMBASE + hex + default 0x100000 + +config RAMTOP + hex + default 0x200000 + +config XIP_ROM_SIZE + hex + default 0x10000 + +config CPU_ADDR_BITS + int + default 36 + config ROM_SIZE hex default 0x800000 diff --git a/arch/x86/cpu/ivybridge/car.S b/arch/x86/cpu/ivybridge/car.S index 0480813..dca68e4 100644 --- a/arch/x86/cpu/ivybridge/car.S +++ b/arch/x86/cpu/ivybridge/car.S @@ -12,9 +12,167 @@ */
#include <common.h> +#include <asm/mtrr.h> +#include <asm/post.h> +#include <asm/processor-flags.h>
- /* Note: ebp must not be touched in this code */ +#define MTRR_PHYS_BASE_MSR(reg) (0x200 + 2 * (reg)) +#define MTRR_PHYS_MASK_MSR(reg) (0x200 + 2 * (reg) + 1) + +#define CACHE_AS_RAM_SIZE CONFIG_DCACHE_RAM_SIZE +#define CACHE_AS_RAM_BASE CONFIG_DCACHE_RAM_BASE + +/* Cache 4GB - MRC_SIZE_KB for MRC */ +#define CACHE_MRC_BYTES ((CONFIG_CACHE_MRC_SIZE_KB << 10) - 1) +#define CACHE_MRC_BASE (0xFFFFFFFF - CACHE_MRC_BYTES) +#define CACHE_MRC_MASK (~CACHE_MRC_BYTES) + +#define CPU_PHYSMASK_HI (1 << (CONFIG_CPU_ADDR_BITS - 32) - 1) + +#define NOEVICTMOD_MSR 0x2e0 + + /* + * Note: ebp must not be touched in this code as it holds the BIST + * value (built-in self test). We preserve this value until it can + * be written to global_data when CAR is ready for use. + */ .globl car_init car_init: - /* TODO: Add cache-as-RAM init here */ + post_code(POST_CAR_START) + + /* Send INIT IPI to all excluding ourself */ + movl $0x000C4500, %eax + movl $0xFEE00300, %esi + movl %eax, (%esi) + + post_code(POST_CAR_SIPI) + /* Zero out all fixed range and variable range MTRRs */ + movl $mtrr_table, %esi + movl $((mtrr_table_end - mtrr_table) / 2), %edi + xorl %eax, %eax + xorl %edx, %edx +clear_mtrrs: + movw (%esi), %bx + movzx %bx, %ecx + wrmsr + add $2, %esi + dec %edi + jnz clear_mtrrs + + post_code(POST_CAR_MTRR) + /* Configure the default memory type to uncacheable */ + movl $MTRRdefType_MSR, %ecx + rdmsr + andl $(~0x00000cff), %eax + wrmsr + + post_code(POST_CAR_UNCACHEABLE) + /* Set Cache-as-RAM base address */ + movl $(MTRR_PHYS_BASE_MSR(0)), %ecx + movl $(CACHE_AS_RAM_BASE | MTRR_TYPE_WRBACK), %eax + xorl %edx, %edx + wrmsr + + post_code(POST_CAR_BASE_ADDRESS) + /* Set Cache-as-RAM mask */ + movl $(MTRR_PHYS_MASK_MSR(0)), %ecx + movl $(~(CACHE_AS_RAM_SIZE - 1) | MTRRphysMaskValid), %eax + movl $CPU_PHYSMASK_HI, %edx + wrmsr + + post_code(POST_CAR_MASK) + + /* Enable MTRR */ + movl $MTRRdefType_MSR, %ecx + rdmsr + orl $MTRRdefTypeEn, %eax + wrmsr + + /* Enable cache (CR0.CD = 0, CR0.NW = 0) */ + movl %cr0, %eax + andl $(~(X86_CR0_CD | X86_CR0_NW)), %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 */ + movl $CACHE_AS_RAM_BASE, %esi + movl %esi, %edi + movl $(CACHE_AS_RAM_SIZE / 4), %ecx + xorl %eax, %eax + rep stosl + + /* enable the 'no eviction run' state */ + movl $NOEVICTMOD_MSR, %ecx + rdmsr + orl $3, %eax + wrmsr + + post_code(POST_CAR_FILL) + /* Enable Cache-as-RAM mode by disabling cache */ + movl %cr0, %eax + orl $X86_CR0_CD, %eax + movl %eax, %cr0 + + /* Enable cache for our code in Flash because we do XIP here */ + movl $MTRR_PHYS_BASE_MSR(1), %ecx + xorl %edx, %edx + movl $car_init_ret, %eax + andl $(~(CONFIG_XIP_ROM_SIZE - 1)), %eax + orl $MTRR_TYPE_WRPROT, %eax + wrmsr + + movl $MTRR_PHYS_MASK_MSR(1), %ecx + movl $CPU_PHYSMASK_HI, %edx + movl $(~(CONFIG_XIP_ROM_SIZE - 1) | MTRRphysMaskValid), %eax + wrmsr + + post_code(POST_CAR_ROM_CACHE) +#ifdef CONFIG_CACHE_MRC_BIN + /* Enable caching for ram init code to run faster */ + movl $MTRR_PHYS_BASE_MSR(2), %ecx + movl $(CACHE_MRC_BASE | MTRR_TYPE_WRPROT), %eax + xorl %edx, %edx + wrmsr + movl $MTRR_PHYS_MASK_MSR(2), %ecx + movl $(CACHE_MRC_MASK | MTRRphysMaskValid), %eax + movl $CPU_PHYSMASK_HI, %edx + wrmsr +#endif + + post_code(POST_CAR_MRC_CACHE) + /* Enable cache */ + movl %cr0, %eax + andl $(~(X86_CR0_CD | X86_CR0_NW)), %eax + movl %eax, %cr0 + + post_code(POST_CAR_CPU_CACHE) + + /* All CPUs need to be in Wait for SIPI state */ +wait_for_sipi: + movl (%esi), %eax + bt $12, %eax + jc wait_for_sipi + + /* return */ jmp car_init_ret + +mtrr_table: + /* Fixed MTRRs */ + .word 0x250, 0x258, 0x259 + .word 0x268, 0x269, 0x26A + .word 0x26B, 0x26C, 0x26D + .word 0x26E, 0x26F + /* Variable MTRRs */ + .word 0x200, 0x201, 0x202, 0x203 + .word 0x204, 0x205, 0x206, 0x207 + .word 0x208, 0x209, 0x20A, 0x20B + .word 0x20C, 0x20D, 0x20E, 0x20F + .word 0x210, 0x211, 0x212, 0x213 +mtrr_table_end: diff --git a/arch/x86/cpu/ivybridge/cpu.c b/arch/x86/cpu/ivybridge/cpu.c index 1cbdaaf..5863811 100644 --- a/arch/x86/cpu/ivybridge/cpu.c +++ b/arch/x86/cpu/ivybridge/cpu.c @@ -12,6 +12,7 @@
#include <common.h> #include <asm/cpu.h> +#include <asm/post.h> #include <asm/processor.h>
DECLARE_GLOBAL_DATA_PTR; @@ -20,6 +21,7 @@ int arch_cpu_init(void) { int ret;
+ post_code(POST_CPU_INIT); timer_set_base(rdtsc());
ret = x86_cpu_init_f(); diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h new file mode 100644 index 0000000..5f05a48 --- /dev/null +++ b/arch/x86/include/asm/mtrr.h @@ -0,0 +1,121 @@ +/* + * Copyright (c) 2014 Google, Inc + * + * From Coreboot file of the same name + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _ASM_MTRR_H +#define _ASM_MTRR_H + +/* These are the region types */ +#define MTRR_TYPE_UNCACHEABLE 0 +#define MTRR_TYPE_WRCOMB 1 +/*#define MTRR_TYPE_ 2*/ +/*#define MTRR_TYPE_ 3*/ +#define MTRR_TYPE_WRTHROUGH 4 +#define MTRR_TYPE_WRPROT 5 +#define MTRR_TYPE_WRBACK 6 +#define MTRR_NUM_TYPES 7 + +#define MTRRcap_MSR 0x0fe +#define MTRRdefType_MSR 0x2ff + +#define MTRRdefTypeEn (1 << 11) +#define MTRRdefTypeFixEn (1 << 10) + +#define SMRRphysBase_MSR 0x1f2 +#define SMRRphysMask_MSR 0x1f3 + +#define MTRRphysBase_MSR(reg) (0x200 + 2 * (reg)) +#define MTRRphysMask_MSR(reg) (0x200 + 2 * (reg) + 1) + +#define MTRRphysMaskValid (1 << 11) + +#define NUM_FIXED_RANGES 88 +#define RANGES_PER_FIXED_MTRR 8 +#define MTRRfix64K_00000_MSR 0x250 +#define MTRRfix16K_80000_MSR 0x258 +#define MTRRfix16K_A0000_MSR 0x259 +#define MTRRfix4K_C0000_MSR 0x268 +#define MTRRfix4K_C8000_MSR 0x269 +#define MTRRfix4K_D0000_MSR 0x26a +#define MTRRfix4K_D8000_MSR 0x26b +#define MTRRfix4K_E0000_MSR 0x26c +#define MTRRfix4K_E8000_MSR 0x26d +#define MTRRfix4K_F0000_MSR 0x26e +#define MTRRfix4K_F8000_MSR 0x26f + +#if !defined(__ASSEMBLER__) + +/* + * The MTRR code has some side effects that the callers should be aware for. + * 1. The call sequence matters. x86_setup_mtrrs() calls + * x86_setup_fixed_mtrrs_no_enable() then enable_fixed_mtrrs() (equivalent + * of x86_setup_fixed_mtrrs()) then x86_setup_var_mtrrs(). If the callers + * want to call the components of x86_setup_mtrrs() because of other + * rquirements the ordering should still preserved. + * 2. enable_fixed_mtrr() will enable both variable and fixed MTRRs because + * of the nature of the global MTRR enable flag. Therefore, all direct + * or indirect callers of enable_fixed_mtrr() should ensure that the + * variable MTRR MSRs do not contain bad ranges. + * 3. If CONFIG_CACHE_ROM is selected an MTRR is allocated for enabling + * the caching of the ROM. However, it is set to uncacheable (UC). It + * is the responsiblity of the caller to enable it by calling + * x86_mtrr_enable_rom_caching(). + */ +void x86_setup_mtrrs(void); +/* + * x86_setup_var_mtrrs() parameters: + * address_bits - number of physical address bits supported by cpu + * above4gb - 2 means dynamically detect number of variable MTRRs available. + * non-zero means handle memory ranges above 4GiB. + * 0 means ignore memory ranges above 4GiB + */ +void x86_setup_var_mtrrs(unsigned int address_bits, unsigned int above4gb); +void enable_fixed_mtrr(void); +void x86_setup_fixed_mtrrs(void); +/* Set up fixed MTRRs but do not enable them. */ +void x86_setup_fixed_mtrrs_no_enable(void); +int x86_mtrr_check(void); +/* ROM caching can be used after variable MTRRs are set up. Beware that + * enabling CONFIG_CACHE_ROM will eat through quite a few MTRRs based on + * one's IO hole size and WRCOMB resources. Be sure to check the console + * log when enabling CONFIG_CACHE_ROM or adding WRCOMB resources. Beware that + * on CPUs with core-scoped MTRR registers such as hyperthreaded CPUs the + * rom caching will be disabled if all threads run the MTRR code. Therefore, + * one needs to call x86_mtrr_enable_rom_caching() after all threads of the + * same core have run the MTRR code. */ +#if CONFIG_CACHE_ROM +void x86_mtrr_enable_rom_caching(void); +void x86_mtrr_disable_rom_caching(void); +/* Return the variable range MTRR index of the ROM cache. */ +long x86_mtrr_rom_cache_var_index(void); +#else +static inline void x86_mtrr_enable_rom_caching(void) {} +static inline void x86_mtrr_disable_rom_caching(void) {} +static inline long x86_mtrr_rom_cache_var_index(void) { return -1; } +#endif /* CONFIG_CACHE_ROM */ + +#endif + +#if !defined(CONFIG_RAMTOP) +# error "CONFIG_RAMTOP not defined" +#endif + +#if ((CONFIG_XIP_ROM_SIZE & (CONFIG_XIP_ROM_SIZE - 1)) != 0) +# error "CONFIG_XIP_ROM_SIZE is not a power of 2" +#endif + +#if ((CONFIG_CACHE_ROM_SIZE & (CONFIG_CACHE_ROM_SIZE - 1)) != 0) +# error "CONFIG_CACHE_ROM_SIZE is not a power of 2" +#endif + +#define CACHE_ROM_BASE (((1 << 20) - (CONFIG_CACHE_ROM_SIZE >> 12)) << 12) + +#if (CONFIG_RAMTOP & (CONFIG_RAMTOP - 1)) != 0 +# error "CONFIG_RAMTOP must be a power of 2" +#endif + +#endif diff --git a/arch/x86/include/asm/post.h b/arch/x86/include/asm/post.h index 3371185..b203dc9 100644 --- a/arch/x86/include/asm/post.h +++ b/arch/x86/include/asm/post.h @@ -13,9 +13,18 @@ /* post codes which represent various stages of init */ #define POST_START 0x1e #define POST_CAR_START 0x1f - +#define POST_CAR_SIPI 0x20 +#define POST_CAR_MTRR 0x21 +#define POST_CAR_UNCACHEABLE 0x22 +#define POST_CAR_BASE_ADDRESS 0x23 +#define POST_CAR_MASK 0x24 +#define POST_CAR_FILL 0x25 +#define POST_CAR_ROM_CACHE 0x26 +#define POST_CAR_MRC_CACHE 0x27 +#define POST_CAR_CPU_CACHE 0x28 #define POST_START_STACK 0x29 #define POST_START_DONE 0x2a +#define POST_CPU_INIT 0x2b
/* Output a post code using al - value must be 0 to 0xff */ #ifdef __ASSEMBLY__ @@ -23,6 +32,8 @@ movb $value, %al; \ outb %al, $POST_PORT #else +#include <asm/io.h> + static inline void post_code(int code) { outb(code, POST_PORT); diff --git a/board/google/chromebook_link/Kconfig b/board/google/chromebook_link/Kconfig index 9c715ba..3a4f557 100644 --- a/board/google/chromebook_link/Kconfig +++ b/board/google/chromebook_link/Kconfig @@ -12,6 +12,18 @@ config SYS_SOC config SYS_CONFIG_NAME default "chromebook_link"
+config BOARD_SPECIFIC_OPTIONS # dummy + def_bool y + select CPU_INTEL_SOCKET_RPGA989 + select NORTHBRIDGE_INTEL_IVYBRIDGE + select SOUTHBRIDGE_INTEL_C216 + select HAVE_ACPI_RESUME + select MARK_GRAPHICS_MEM_WRCOMB + +config MMCONF_BASE_ADDRESS + hex + default 0xf0000000 + config EARLY_POST_CROS_EC bool "Enable early post to Chrome OS EC" default y