diff options
Diffstat (limited to 'arch/x86/cpu/mtrr.c')
| -rw-r--r-- | arch/x86/cpu/mtrr.c | 31 |
1 files changed, 23 insertions, 8 deletions
diff --git a/arch/x86/cpu/mtrr.c b/arch/x86/cpu/mtrr.c index 3094006562..0939736164 100644 --- a/arch/x86/cpu/mtrr.c +++ b/arch/x86/cpu/mtrr.c @@ -11,6 +11,11 @@ * System Programming */ +/* + * Note that any console output (e.g. debug()) in this file will likely fail + * since the MTRR registers are sometimes in flux. + */ + #include <common.h> #include <asm/io.h> #include <asm/msr.h> @@ -19,27 +24,29 @@ DECLARE_GLOBAL_DATA_PTR; /* Prepare to adjust MTRRs */ -void mtrr_open(struct mtrr_state *state) +void mtrr_open(struct mtrr_state *state, bool do_caches) { if (!gd->arch.has_mtrr) return; - state->enable_cache = dcache_status(); + if (do_caches) { + state->enable_cache = dcache_status(); - if (state->enable_cache) - disable_caches(); + if (state->enable_cache) + disable_caches(); + } state->deftype = native_read_msr(MTRR_DEF_TYPE_MSR); wrmsrl(MTRR_DEF_TYPE_MSR, state->deftype & ~MTRR_DEF_TYPE_EN); } /* Clean up after adjusting MTRRs, and enable them */ -void mtrr_close(struct mtrr_state *state) +void mtrr_close(struct mtrr_state *state, bool do_caches) { if (!gd->arch.has_mtrr) return; wrmsrl(MTRR_DEF_TYPE_MSR, state->deftype | MTRR_DEF_TYPE_EN); - if (state->enable_cache) + if (do_caches && state->enable_cache) enable_caches(); } @@ -50,10 +57,14 @@ int mtrr_commit(bool do_caches) uint64_t mask; int i; + debug("%s: enabled=%d, count=%d\n", __func__, gd->arch.has_mtrr, + gd->arch.mtrr_req_count); if (!gd->arch.has_mtrr) return -ENOSYS; - mtrr_open(&state); + debug("open\n"); + mtrr_open(&state, do_caches); + debug("open done\n"); for (i = 0; i < gd->arch.mtrr_req_count; i++, req++) { mask = ~(req->size - 1); mask &= (1ULL << CONFIG_CPU_ADDR_BITS) - 1; @@ -62,9 +73,12 @@ int mtrr_commit(bool do_caches) } /* Clear the ones that are unused */ + debug("clear\n"); for (; i < MTRR_COUNT; i++) wrmsrl(MTRR_PHYS_MASK_MSR(i), 0); - mtrr_close(&state); + debug("close\n"); + mtrr_close(&state, do_caches); + debug("mtrr done\n"); return 0; } @@ -74,6 +88,7 @@ int mtrr_add_request(int type, uint64_t start, uint64_t size) struct mtrr_request *req; uint64_t mask; + debug("%s: count=%d\n", __func__, gd->arch.mtrr_req_count); if (!gd->arch.has_mtrr) return -ENOSYS; |