diff options
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/x86/mp_init.c | 1 | ||||
| -rw-r--r-- | src/cpu/x86/smm/smm_module_loader.c | 57 |
2 files changed, 54 insertions, 4 deletions
diff --git a/src/cpu/x86/mp_init.c b/src/cpu/x86/mp_init.c index b336e9f2d1..dd5e94d4f2 100644 --- a/src/cpu/x86/mp_init.c +++ b/src/cpu/x86/mp_init.c @@ -790,7 +790,6 @@ static enum cb_err install_permanent_handler(int num_cpus, uintptr_t smbase, .num_cpus = num_cpus, .cpu_save_state_size = save_state_size, .num_concurrent_save_states = num_cpus, - .cr3 = read_cr3(), }; printk(BIOS_DEBUG, "Installing permanent SMM handler to 0x%08lx\n", smbase); diff --git a/src/cpu/x86/smm/smm_module_loader.c b/src/cpu/x86/smm/smm_module_loader.c index d965593c55..e342557b13 100644 --- a/src/cpu/x86/smm/smm_module_loader.c +++ b/src/cpu/x86/smm/smm_module_loader.c @@ -8,7 +8,9 @@ #include <cpu/cpu.h> #include <cpu/x86/smm.h> #include <device/device.h> +#include <device/mmio.h> #include <rmodule.h> +#include <stdint.h> #include <stdio.h> #include <string.h> #include <types.h> @@ -259,6 +261,7 @@ static int smm_module_setup_stub(const uintptr_t smbase, const size_t smm_size, stub_params->stack_top = stack_top; stub_params->stack_size = g_stack_size; stub_params->c_handler = (uintptr_t)params->handler; + stub_params->cr3 = params->cr3; /* This runs on the BSP. All the APs are its siblings */ struct cpu_info *info = cpu_info(); @@ -353,8 +356,8 @@ static void print_region(const char *name, const struct region region) region_end(®ion)); } -/* STM + Handler + (Stub + Save state) * CONFIG_MAX_CPUS + stacks */ -#define SMM_REGIONS_ARRAY_SIZE (1 + 1 + CONFIG_MAX_CPUS * 2 + 1) +/* STM + Handler + (Stub + Save state) * CONFIG_MAX_CPUS + stacks + page tables*/ +#define SMM_REGIONS_ARRAY_SIZE (1 + 1 + CONFIG_MAX_CPUS * 2 + 1 + 1) static int append_and_check_region(const struct region smram, const struct region region, @@ -389,6 +392,39 @@ static int append_and_check_region(const struct region smram, return 0; } +#define _PRES (1ULL << 0) +#define _RW (1ULL << 1) +#define _US (1ULL << 2) +#define _A (1ULL << 5) +#define _D (1ULL << 6) +#define _PS (1ULL << 7) +#define _GEN_DIR(a) (_PRES + _RW + _US + _A + (a)) +#define _GEN_PAGE(a) (_PRES + _RW + _US + _PS + _A + _D + (a)) +#define PAGE_SIZE 8 + +/* Return the PM4LE */ +static uintptr_t install_page_table(const uintptr_t handler_base) +{ + const bool one_g_pages = !!(cpuid_edx(0x80000001) & (1 << 26)); + /* 4 1G pages or 4 PDPE entries with 512 * 2M pages */ + const size_t pages_needed = one_g_pages ? 4 : 2048 + 4; + const uintptr_t pages_base = ALIGN_DOWN(handler_base - pages_needed * PAGE_SIZE, 4096); + const uintptr_t pm4le = ALIGN_DOWN(pages_base - 8, 4096); + + if (one_g_pages) { + for (size_t i = 0; i < 4; i++) + write64p(pages_base + i * PAGE_SIZE, _GEN_PAGE(1ull * GiB * i)); + write64p(pm4le, _GEN_DIR(pages_base)); + } else { + for (size_t i = 0; i < 2048; i++) + write64p(pages_base + i * PAGE_SIZE, _GEN_PAGE(2ull * MiB * i)); + write64p(pm4le, _GEN_DIR(pages_base + 2048 * PAGE_SIZE)); + for (size_t i = 0; i < 4; i++) + write64p(pages_base + (2048 + i) * PAGE_SIZE, _GEN_DIR(pages_base + 4096 * i)); + } + return pm4le; +} + /* *The SMM module is placed within the provided region in the following * manner: @@ -398,6 +434,8 @@ static int append_and_check_region(const struct region smram, * +-----------------+ * | smi handler | * | ... | + * +-----------------+ + * | page tables | * +-----------------+ <- cpu0 * | stub code | <- cpu1 * | stub code | <- cpu2 @@ -453,7 +491,20 @@ int smm_load_module(const uintptr_t smram_base, const size_t smram_size, if (append_and_check_region(smram, handler, region_list, "HANDLER")) return -1; - uintptr_t stub_segment_base = handler_base - SMM_CODE_SEGMENT_SIZE; + uintptr_t stub_segment_base; + if (ENV_X86_64) { + uintptr_t pt_base = install_page_table(handler_base); + struct region page_tables = { + .offset = pt_base, + .size = handler_base - pt_base, + }; + if (append_and_check_region(smram, page_tables, region_list, "PAGE TABLES")) + return -1; + params->cr3 = pt_base; + stub_segment_base = pt_base - SMM_CODE_SEGMENT_SIZE; + } else { + stub_segment_base = handler_base - SMM_CODE_SEGMENT_SIZE; + } if (!smm_create_map(stub_segment_base, params->num_concurrent_save_states, params)) { printk(BIOS_ERR, "%s: Error creating CPU map\n", __func__); |