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| author | Ian Moffett <ian@osmora.org> | 2024-02-29 21:55:23 -0500 |
|---|---|---|
| committer | Ian Moffett <ian@osmora.org> | 2024-02-29 21:55:23 -0500 |
| commit | 31aa84528af5a92c3019e6abaa949eb20a4e73d9 (patch) | |
| tree | f65288c97f2d965ddb785f47b80403454caaaaec | |
| parent | 4e5226d3f399db93627538f224f42b3637edf223 (diff) | |
kernel/amd64: pmap: Add routine to switch vas
Signed-off-by: Ian Moffett <ian@osmora.org>
| -rw-r--r-- | sys/arch/amd64/amd64/pmap.c | 11 | ||||
| -rw-r--r-- | sys/include/vm/pmap.h | 6 |
2 files changed, 17 insertions, 0 deletions
diff --git a/sys/arch/amd64/amd64/pmap.c b/sys/arch/amd64/amd64/pmap.c index 5fe1e3b..e898e74 100644 --- a/sys/arch/amd64/amd64/pmap.c +++ b/sys/arch/amd64/amd64/pmap.c @@ -215,6 +215,17 @@ pmap_create_vas(struct vm_ctx *ctx) return new_vas; } +void +pmap_switch_vas(struct vm_ctx *ctx, struct vas vas) +{ + uintptr_t cr3_val = vas.cr3_flags | vas.top_level; + + __ASMV("mov %0, %%cr3" + : + : "r" (cr3_val) + : "memory"); +} + struct vas pmap_read_vas(void) { diff --git a/sys/include/vm/pmap.h b/sys/include/vm/pmap.h index c591605..516c2ea 100644 --- a/sys/include/vm/pmap.h +++ b/sys/include/vm/pmap.h @@ -72,6 +72,12 @@ struct vm_ctx { struct vas pmap_create_vas(struct vm_ctx *); /* + * Switch the current virtual address space + * to another. + */ +void pmap_switch_vas(struct vm_ctx *, struct vas); + +/* * Read virtual address space descriptor * and return it. */ |