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| author | Simon Glass <sjg@chromium.org> | 2019-09-25 08:56:46 -0600 |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2019-10-08 13:57:48 +0800 |
| commit | add3f4c9186fbd94b6e89c1d277b544a7a6ad404 (patch) | |
| tree | a59d8963c9491687391aae34f638e344b919b665 /arch/x86/include/asm/mtrr.h | |
| parent | 6ccb2f890bb5bfdd6aed4a99294fd77508436c40 (diff) | |
| download | u-boot-add3f4c9186fbd94b6e89c1d277b544a7a6ad404.tar.gz u-boot-add3f4c9186fbd94b6e89c1d277b544a7a6ad404.tar.xz u-boot-add3f4c9186fbd94b6e89c1d277b544a7a6ad404.zip | |
x86: Add a function to set variable MTRRs
Normally U-Boot handles MTRRs through an add/commit process which
overwrites all MTRRs. But in very early boot it is not desirable to clear
the existing MTRRs since they may be in use and it can cause a hang.
Add a new mtrr_set_next_var() function which sets up the next available
MTRR to the required region.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: pass 'type' to set_var_mtrr() in mtrr_set_next_var()]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'arch/x86/include/asm/mtrr.h')
| -rw-r--r-- | arch/x86/include/asm/mtrr.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h index 6f29e75ce6..672617256e 100644 --- a/arch/x86/include/asm/mtrr.h +++ b/arch/x86/include/asm/mtrr.h @@ -117,6 +117,18 @@ int mtrr_add_request(int type, uint64_t start, uint64_t size); */ int mtrr_commit(bool do_caches); +/** + * mtrr_set_next_var() - set up a variable MTRR + * + * This finds the first free variable MTRR and sets to the given area + * + * @type: Requested type (MTRR_TYPE_) + * @start: Start address + * @size: Size + * @return 0 on success, -ENOSPC if there are no more MTRRs + */ +int mtrr_set_next_var(uint type, uint64_t base, uint64_t size); + #endif #if ((CONFIG_XIP_ROM_SIZE & (CONFIG_XIP_ROM_SIZE - 1)) != 0) |