diff options
Diffstat (limited to 'arch/x86/cpu/mtrr.c')
| -rw-r--r-- | arch/x86/cpu/mtrr.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86/cpu/mtrr.c b/arch/x86/cpu/mtrr.c index d5a825d..5d36b3e 100644 --- a/arch/x86/cpu/mtrr.c +++ b/arch/x86/cpu/mtrr.c @@ -17,9 +17,14 @@ #include <asm/msr.h> #include <asm/mtrr.h> +DECLARE_GLOBAL_DATA_PTR; + /* Prepare to adjust MTRRs */ void mtrr_open(struct mtrr_state *state) { + if (!gd->arch.has_mtrr) + return; + state->enable_cache = dcache_status(); if (state->enable_cache) @@ -31,6 +36,9 @@ void mtrr_open(struct mtrr_state *state) /* Clean up after adjusting MTRRs, and enable them */ void mtrr_close(struct mtrr_state *state) { + if (!gd->arch.has_mtrr) + return; + wrmsrl(MTRR_DEF_TYPE_MSR, state->deftype | MTRR_DEF_TYPE_EN); if (state->enable_cache) enable_caches(); @@ -43,6 +51,9 @@ int mtrr_commit(bool do_caches) uint64_t mask; int i; + if (!gd->arch.has_mtrr) + return -ENOSYS; + mtrr_open(&state); for (i = 0; i < gd->arch.mtrr_req_count; i++, req++) { mask = ~(req->size - 1); @@ -64,6 +75,9 @@ int mtrr_add_request(int type, uint64_t start, uint64_t size) struct mtrr_request *req; uint64_t mask; + if (!gd->arch.has_mtrr) + return -ENOSYS; + if (gd->arch.mtrr_req_count == MAX_MTRR_REQUESTS) return -ENOSPC; req = &gd->arch.mtrr_req[gd->arch.mtrr_req_count++]; |