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[app][uefi] Place linux kernel at identity mapped virtual memory addresses

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This commit is contained in:
Kelvin Zhang
2024-08-20 12:31:06 -07:00
parent 253e3099ec
commit 347db09959
6 changed files with 101 additions and 35 deletions
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2
kernel/include/kernel/vm.h
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@@ -259,7 +259,7 @@ void vmm_context_switch(vmm_aspace_t *oldspace, vmm_aspace_t *newaspace);
/* set the current user aspace as active on the current thread.
NULL is a valid argument, which unmaps the current user address space */
void vmm_set_active_aspace(vmm_aspace_t *aspace);
vmm_aspace_t* vmm_set_active_aspace(vmm_aspace_t *aspace);
__END_CDECLS

12
kernel/vm/vmm.c
View File

@@ -12,6 +12,7 @@
#include <lk/err.h>
#include <lk/trace.h>
#include <string.h>
#include "kernel/thread.h"
#include "vm_priv.h"
#define LOCAL_TRACE 0
@@ -751,21 +752,24 @@ void vmm_context_switch(vmm_aspace_t *oldspace, vmm_aspace_t *newaspace) {
arch_mmu_context_switch(newaspace ? &newaspace->arch_aspace : NULL);
}
void vmm_set_active_aspace(vmm_aspace_t *aspace) {
vmm_aspace_t* vmm_set_active_aspace(vmm_aspace_t *aspace) {
LTRACEF("aspace %p\n", aspace);
thread_t *t = get_current_thread();
DEBUG_ASSERT(t);
if (aspace == t->aspace)
return;
return aspace;
/* grab the thread lock and switch to the new address space */
THREAD_LOCK(state);
vmm_aspace_t *old = t->aspace;
t->aspace = aspace;
vmm_context_switch(old, t->aspace);
if (old != aspace) {
t->aspace = aspace;
vmm_context_switch(old, t->aspace);
}
THREAD_UNLOCK(state);
return old;
}
static void dump_region(const vmm_region_t *r) {