diff options
| -rw-r--r-- | src/northbridge/intel/gm45/ram_calc.c | 42 |
1 files changed, 11 insertions, 31 deletions
diff --git a/src/northbridge/intel/gm45/ram_calc.c b/src/northbridge/intel/gm45/ram_calc.c index 92f1a7f7e3..146bcf2c7f 100644 --- a/src/northbridge/intel/gm45/ram_calc.c +++ b/src/northbridge/intel/gm45/ram_calc.c @@ -25,40 +25,20 @@ #include <cbmem.h> #include "gm45.h" -/** Decodes used Graphics Mode Select (GMS) to kilobytes. */ +/* + * Decodes used Graphics Mode Select (GMS) to kilobytes. + * The options for 1M, 4M, 8M and 16M preallocated igd memory are + * undocumented but are verified to work. + */ u32 decode_igd_memory_size(const u32 gms) { - switch (gms) { - case 1: - return 1 << 10; - case 2: - return 4 << 10; /* guessed */ - case 3: - return 8 << 10; /* guessed */ - case 4: - return 16 << 10; - case 5: - return 32 << 10; - case 6: - return 48 << 10; - case 7: - return 64 << 10; - case 8: - return 128 << 10; - case 9: - return 256 << 10; - case 10: - return 96 << 10; - case 11: - return 160 << 10; - case 12: - return 224 << 10; - case 13: - return 352 << 10; - default: + static const u16 ggc2uma[] = { 0, 1, 4, 8, 16, 32, 48, 64, 128, 256, + 96, 160, 224, 352 }; + + if (gms > ARRAY_SIZE(ggc2uma)) die("Bad Graphics Mode Select (GMS) setting.\n"); - return 0; - } + + return ggc2uma[gms] << 10; } /** Decodes used Graphics Stolen Memory (GSM) to kilobytes. */ |