diff options
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/x86/mtrr/mtrr.c | 33 |
1 files changed, 29 insertions, 4 deletions
diff --git a/src/cpu/x86/mtrr/mtrr.c b/src/cpu/x86/mtrr/mtrr.c index 2e45c4818c..72373751eb 100644 --- a/src/cpu/x86/mtrr/mtrr.c +++ b/src/cpu/x86/mtrr/mtrr.c @@ -37,6 +37,10 @@ #include <cpu/x86/mtrr.h> #include <cpu/x86/cache.h> +#ifdef CONFIG_GFXUMA +extern uint64_t uma_memory_base, uma_memory_size; +#endif + static unsigned int mtrr_msr[] = { MTRRfix64K_00000_MSR, MTRRfix16K_80000_MSR, MTRRfix16K_A0000_MSR, MTRRfix4K_C0000_MSR, MTRRfix4K_C8000_MSR, MTRRfix4K_D0000_MSR, MTRRfix4K_D8000_MSR, @@ -164,7 +168,7 @@ static inline unsigned int fls(unsigned int x) * ramsize = 156MB == 128MB WB (at 0MB) + 32MB WB (at 128MB) + 4MB UC (at 156MB) */ /* 2 MTRRS are reserved for the operating system */ -#if 0 +#if 1 #define BIOS_MTRRS 6 #define OS_MTRRS 2 #else @@ -229,13 +233,21 @@ static unsigned int range_to_mtrr(unsigned int reg, unsigned long next_range_startk, unsigned char type, unsigned address_bits) { if (!range_sizek) { - printk_debug("range_to_mtrr called for empty range\n"); + /* If there's no MTRR hole, this function will bail out + * here when called for the hole. + */ + printk_spew("Zero-sized MTRR range @%ldKB\n", range_startk); return reg; } + if (reg >= BIOS_MTRRS) { - printk_err("Running out of variable MTRRs!\n"); + printk_err("Warning: Out of MTRRs for base: %4ldMB, range: %ldMB, type %s\n", + range_startk >>10, range_sizek >> 10, + (type==MTRR_TYPE_UNCACHEABLE)?"UC": + ((type==MTRR_TYPE_WRBACK)?"WB":"Other") ); return reg; } + while(range_sizek) { unsigned long max_align, align; unsigned long sizek; @@ -375,6 +387,7 @@ void x86_setup_fixed_mtrrs(void) enable_fixed_mtrr(); } + void x86_setup_var_mtrrs(unsigned address_bits) /* this routine needs to know how many address bits a given processor * supports. CPUs get grumpy when you set too many bits in @@ -401,10 +414,22 @@ void x86_setup_var_mtrrs(unsigned address_bits) #endif var_state.reg = 0; var_state.address_bits = address_bits; + search_global_resources( IORESOURCE_MEM | IORESOURCE_CACHEABLE, IORESOURCE_MEM | IORESOURCE_CACHEABLE, set_var_mtrr_resource, &var_state); - +#ifdef CONFIG_GFXUMA + // For now we assume the UMA space is at the end of memory + if (var_state.hole_startk || var_state.hole_sizek) { + printk_debug("Warning: Can't set up MTRR hole for UMA due to pre-existing MTRR hole.\n"); + } else { + // Increase the base range and set up UMA as an UC hole instead + var_state.range_sizek += (uma_memory_size >> 10); + + var_state.hole_startk = (uma_memory_base >> 10); + var_state.hole_sizek = (uma_memory_size >> 10); + } +#endif /* Write the last range */ var_state.reg = range_to_mtrr(var_state.reg, var_state.range_startk, var_state.range_sizek, 0, MTRR_TYPE_WRBACK, var_state.address_bits); |