diff options
Diffstat (limited to 'src/northbridge/intel/x4x/ram_calc.c')
-rw-r--r-- | src/northbridge/intel/x4x/ram_calc.c | 47 |
1 files changed, 39 insertions, 8 deletions
diff --git a/src/northbridge/intel/x4x/ram_calc.c b/src/northbridge/intel/x4x/ram_calc.c index 1f1c13f092..6484326e57 100644 --- a/src/northbridge/intel/x4x/ram_calc.c +++ b/src/northbridge/intel/x4x/ram_calc.c @@ -28,6 +28,7 @@ #include <cpu/x86/mtrr.h> #include <northbridge/intel/x4x/x4x.h> #include <program_loading.h> +#include <cpu/intel/smm/gen1/smi.h> /** Decodes used Graphics Mode Select (GMS) to kilobytes. */ u32 decode_igd_memory_size(const u32 gms) @@ -52,6 +53,25 @@ u32 decode_igd_gtt_size(const u32 gsm) return ggc2gtt[gsm] << 10; } +/** Decodes used TSEG size to bytes. */ +u32 decode_tseg_size(const u32 esmramc) +{ + if (!(esmramc & 1)) + return 0; + + switch ((esmramc >> 1) & 3) { + case 0: + return 1 << 20; + case 1: + return 2 << 20; + case 2: + return 8 << 20; + case 3: + default: + die("Bad TSEG setting.\n"); + } +} + u8 decode_pciebar(u32 *const base, u32 *const len) { *base = 0; @@ -92,14 +112,25 @@ u8 decode_pciebar(u32 *const base, u32 *const len) return 1; } +u32 northbridge_get_tseg_size(void) +{ + const u8 esmramc = pci_read_config8(PCI_DEV(0, 0, 0), D0F0_ESMRAMC); + return decode_tseg_size(esmramc); +} + +u32 northbridge_get_tseg_base(void) +{ + return pci_read_config32(PCI_DEV(0, 0, 0), D0F0_TSEG); +} + + /* Depending of UMA and TSEG configuration, TSEG might start at any * 1 MiB alignment. As this may cause very greedy MTRR setup, push * CBMEM top downwards to 4 MiB boundary. */ void *cbmem_top(void) { - uintptr_t top_of_ram = pci_read_config32(PCI_DEV(0, 0, 0), D0F0_TSEG); - top_of_ram = ALIGN_DOWN(top_of_ram, 4*MiB); + uintptr_t top_of_ram = ALIGN_DOWN(northbridge_get_tseg_base(), 4*MiB); return (void *) top_of_ram; } @@ -122,14 +153,14 @@ void platform_enter_postcar(void) /* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */ postcar_frame_add_mtrr(&pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK); - /* Cache two separate 4 MiB regions below the top of ram, this - * satisfies MTRR alignment requirements. If you modify this to - * cover TSEG, make sure UMA region is not set with WRBACK as it - * causes hard-to-recover boot failures. + /* Cache 8 MiB region below the top of ram and 2 MiB above top of + * ram to cover both cbmem as the TSEG region. */ top_of_ram = (uintptr_t)cbmem_top(); - postcar_frame_add_mtrr(&pcf, top_of_ram - 4*MiB, 4*MiB, MTRR_TYPE_WRBACK); - postcar_frame_add_mtrr(&pcf, top_of_ram - 8*MiB, 4*MiB, MTRR_TYPE_WRBACK); + postcar_frame_add_mtrr(&pcf, top_of_ram - 8*MiB, 8*MiB, + MTRR_TYPE_WRBACK); + postcar_frame_add_mtrr(&pcf, northbridge_get_tseg_base(), + northbridge_get_tseg_size(), MTRR_TYPE_WRBACK); run_postcar_phase(&pcf); |