user_space #4

Merged
mathieu merged 40 commits from user_space into master 2021-11-04 16:17:36 +01:00
4 changed files with 118 additions and 0 deletions
Showing only changes of commit 7f6bb8eef3 - Show all commits

79
arch/x86/mmuContext.c Normal file
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@ -0,0 +1,79 @@
#include "mmuContext.h"
#include "alloc.h"
#include "allocArea.h"
#include "errno.h"
#include "klibc.h"
#include "irq.h"
#include "list.h"
#include "paging.h"
#include "stdarg.h"
#include "types.h"
struct mmu_context {
paddr_t paddr_PD;
vaddr_t vaddr_PD;
uint32_t ref;
struct mmu_context *next, *prev;
};
static struct mmu_context *listContext = NULL;
static struct mmu_context *currentContext = NULL;
int mmuContextSetup()
{
struct mmu_context *initialCtx;
int ret = 0;
initialCtx = malloc(sizeof(struct mmu_context));
if (initialCtx == NULL)
return -ENOMEM;
initialCtx->paddr_PD = pagingGetCurrentPDPaddr();
initialCtx->vaddr_PD = areaAlloc(1, 0);
ret = pageMap(initialCtx->vaddr_PD, initialCtx->paddr_PD,
PAGING_MEM_WRITE | PAGING_MEM_READ);
if (ret)
return ret;
list_singleton(listContext, initialCtx);
currentContext = initialCtx;
// We create the context and we are using it
initialCtx->ref = 2;
return 0;
}
struct mmu_context *mmuContextCreate()
{
struct mmu_context *ctx;
uint32_t flags;
ctx = malloc(sizeof(struct mmu_context));
if (ctx == NULL)
return NULL;
ctx->vaddr_PD = areaAlloc(1, AREA_PHY_MAP);
if (ctx->vaddr_PD == (vaddr_t)NULL) {
pr_info("Fail to allocate MMU Context\n");
free(ctx);
return NULL;
}
ctx->paddr_PD = pagingGetPaddr(ctx->vaddr_PD);
ctx->ref = 1;
//TODO copy kernel space
disable_IRQs(flags);
list_add_tail(listContext, ctx);
restore_IRQs(flags);
return ctx;
}

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@ -198,7 +198,38 @@ int pageUnmap(vaddr_t vaddr)
return 0;
}
paddr_t pagingGetPaddr(vaddr_t vaddr)
{
/* Get the page directory entry and table entry index for this
address */
unsigned pdEntry = vaddr >> PD_SHIFT;
unsigned ptEntry = vaddr >> PT_SHIFT;
unsigned pageOffset = vaddr & PAGE_MASK;
/* Get the PD of the current context */
struct pde *pd =
(struct pde *)((PD_MIRROR_PAGE_IDX << PD_SHIFT) + (PD_MIRROR_PAGE_IDX << PT_SHIFT));
/* Address of the PT in the mirroring */
struct pte *pt = (struct pte *)((PD_MIRROR_PAGE_IDX << PD_SHIFT) + (pdEntry << PT_SHIFT));
/* No page mapped at this address ? */
if (!pd[pdEntry].present)
return (paddr_t)NULL;
if (!pt[ptEntry].present)
return (paddr_t)NULL;
return (pt[ptEntry].paddr << PT_SHIFT) + pageOffset;
}
unsigned long getNbMappedPage(void)
{
return mappedPage;
}
paddr_t pagingGetCurrentPDPaddr()
{
struct pdbr pdbr;
asm volatile("movl %%cr3, %0\n": "=r"(pdbr));
return (pdbr.pd_paddr << 12);
}

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@ -10,3 +10,6 @@ int pagingSetup(paddr_t lowerKernelAddr, paddr_t upperKernelAddr);
int pageMap(vaddr_t vaddr, paddr_t paddr, int flags);
int pageUnmap(vaddr_t vaddr);
unsigned long getNbMappedPage(void);
paddr_t pagingGetPaddr(vaddr_t vaddr);
paddr_t pagingGetCurrentPDPaddr();

5
core/mmuContext.h Normal file
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@ -0,0 +1,5 @@
#pragma once
struct mmu_context;
int mmuContextSetup();
struct mmu_context *mmuContextCreate();