diff options
Diffstat (limited to 'src/northbridge')
| -rw-r--r-- | src/northbridge/amd/agesa/family12/northbridge.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/northbridge/amd/agesa/family12/northbridge.c b/src/northbridge/amd/agesa/family12/northbridge.c index 6a591c5851..d7458ff8de 100644 --- a/src/northbridge/amd/agesa/family12/northbridge.c +++ b/src/northbridge/amd/agesa/family12/northbridge.c @@ -31,6 +31,7 @@ #include <cbmem.h> #include <cpu/x86/lapic.h> +#include <cpu/amd/mtrr.h> #include "chip.h" #include "northbridge.h" @@ -468,6 +469,50 @@ static void set_resources(device_t dev) printk(BIOS_DEBUG, "Fam12h - northbridge.c - set_resources - End.\n"); } +void setup_uma_memory(void) +{ +#if CONFIG_GFXUMA + msr_t msr, msr2; + uint32_t sys_mem; + + /* TOP_MEM: the top of DRAM below 4G */ + msr = rdmsr(TOP_MEM); + printk + (BIOS_INFO, "%s, TOP MEM: msr.lo = 0x%08x, msr.hi = 0x%08x\n", + __func__, msr.lo, msr.hi); + + /* TOP_MEM2: the top of DRAM above 4G */ + msr2 = rdmsr(TOP_MEM2); + printk + (BIOS_INFO, "%s, TOP MEM2: msr2.lo = 0x%08x, msr2.hi = 0x%08x\n", + __func__, msr2.lo, msr2.hi); + + /* refer to UMA Size Consideration in Family12h BKDG. */ + /* Please reference MemNGetUmaSizeLN () */ + /* + * Total system memory UMASize + * >= 2G 512M + * >=1G 256M + * <1G 64M + */ + sys_mem = msr.lo + 0x1000000; // Ignore 16MB allocated for C6 when finding UMA size + if ((msr.hi & 0x0000000F) || (sys_mem >= 0x80000000)) { + uma_memory_size = 0x20000000; /* >= 2G memory, 512M recommended UMA */ + } else if (sys_mem >= 0x40000000) { + uma_memory_size = 0x10000000; /* >= 1G memory, 256M recommended UMA */ + } else { + uma_memory_size = 0x4000000; /* <1G memory, 64M recommended UMA */ + } + uma_memory_base = msr.lo - uma_memory_size; /* TOP_MEM1 */ + printk(BIOS_INFO, "%s: uma size 0x%08llx, memory start 0x%08llx\n", + __func__, uma_memory_size, uma_memory_base); + + /* TODO: TOP_MEM2 */ +#else + uma_memory_size = 0x10000000; /* 256M recommended UMA */ + uma_memory_base = 0x30000000; /* 1GB system memory supported */ +#endif +} /* Domain/Root Complex related code */ |