diff options
Diffstat (limited to 'src/northbridge/amd')
| -rw-r--r-- | src/northbridge/amd/agesa/family15tn/northbridge.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/northbridge/amd/agesa/family15tn/northbridge.c b/src/northbridge/amd/agesa/family15tn/northbridge.c index 1e14e8e97e..dc04afdbe5 100644 --- a/src/northbridge/amd/agesa/family15tn/northbridge.c +++ b/src/northbridge/amd/agesa/family15tn/northbridge.c @@ -613,6 +613,54 @@ static struct hw_mem_hole_info get_hw_mem_hole_info(void) } #endif +#define ONE_MB 0x100000 + +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 Family15h BKDG. */ + /* Please reference MemNGetUmaSizeOR () */ + /* + * Total system memory UMASize + * >= 2G 512M + * >=1G 256M + * <1G 64M + */ + sys_mem = msr.lo + 16 * ONE_MB; // Ignore 16MB allocated for C6 when finding UMA size + if ((msr2.hi & 0x0000000F) || (sys_mem >= 2048 * ONE_MB)) { + uma_memory_size = 512 * ONE_MB; + } else if (sys_mem >= 1024 * ONE_MB) { + uma_memory_size = 256 * ONE_MB; + } else { + uma_memory_size = 64 * ONE_MB; + } + 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 = 256 * ONE_MB; /* 256M recommended UMA */ + uma_memory_base = 768 * ONE_MB; /* 1GB system memory supported */ +#endif +} + + static void domain_set_resources(device_t dev) { #if CONFIG_PCI_64BIT_PREF_MEM == 1 |