diff options
Diffstat (limited to 'src/northbridge/amd')
| -rw-r--r-- | src/northbridge/amd/amdk8/northbridge.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/src/northbridge/amd/amdk8/northbridge.c b/src/northbridge/amd/amdk8/northbridge.c index 8b9140dd5f..a7aa19dc42 100644 --- a/src/northbridge/amd/amdk8/northbridge.c +++ b/src/northbridge/amd/amdk8/northbridge.c @@ -18,6 +18,7 @@ #include <cpu/cpu.h> #include <cpu/x86/lapic.h> +#include <cpu/amd/mtrr.h> #include <cpu/amd/multicore.h> #if CONFIG_LOGICAL_CPUS @@ -822,6 +823,68 @@ static u32 hoist_memory(unsigned long hole_startk, int node_id) #include <cbmem.h> #endif +void setup_uma_memory(void) +{ +#if CONFIG_GFXUMA + msr_t msr, msr2; + + /* 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: msr.lo = 0x%08x, msr.hi = 0x%08x\n", + __func__, msr2.lo, msr2.hi); + +#if !CONFIG_BOARD_ASROCK_939A785GMH && !CONFIG_BOARD_AMD_MAHOGANY + + switch (msr.lo) { + case 0x10000000: /* 256M system memory */ + uma_memory_size = 0x2000000; /* 32M recommended UMA */ + break; + + case 0x18000000: /* 384M system memory */ + uma_memory_size = 0x4000000; /* 64M recommended UMA */ + break; + + case 0x20000000: /* 512M system memory */ + uma_memory_size = 0x4000000; /* 64M recommended UMA */ + break; + + default: /* 1GB and above system memory */ + uma_memory_size = 0x8000000; /* 128M recommended UMA */ + break; + } +#else + /* refer to UMA Size Consideration in 780 BDG. */ + switch (msr.lo) { + case 0x10000000: /* 256M system memory */ + uma_memory_size = 0x4000000; /* 64M recommended UMA */ + break; + + case 0x20000000: /* 512M system memory */ + uma_memory_size = 0x8000000; /* 128M recommended UMA */ + break; + + default: /* 1GB and above system memory */ + uma_memory_size = 0x10000000; /* 256M recommended UMA */ + break; + } +#endif + + 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 = 0x8000000; /* 128M recommended UMA */ + uma_memory_base = 0x38000000; /* 1GB system memory supposed */ +#endif +} + static void amdk8_domain_set_resources(device_t dev) { #if CONFIG_PCI_64BIT_PREF_MEM |