94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
#include "include/pmap.h"
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#include <machine/metalp.h>
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#include <machine/paging.h>
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#include <machine/pmap.h>
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#include <machine/mrt.h>
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#include <sys/types.h>
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#include <string.h>
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// page table for boot
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static struct vmpt boot_pt;
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#define BOOT_PD_NUM (4)
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static struct vmpd boot_pd[BOOT_PD_NUM];
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static struct vmpd boot_dev_pd[BOOT_PD_NUM];
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void
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vm_insert_pd(struct vmpt * pt, struct vmpd * pd, unsigned int pgshift, paddr_t paddr)
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{
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const uint64_t pfn = vm_get_pfn(pd->vaddr, pgshift);
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int hash = vm_vahash(pfn);
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struct vmpte * vmpte = &pt->entries[hash];
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pd->next = vmpte->first;
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vmpte->first = paddr;
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}
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void paging_init()
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{
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int ret;
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memset(&boot_pd, 0, sizeof(boot_pd));
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memset(&boot_pt, 0, sizeof(boot_pt));
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// ident map the first 4GB
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paddr_t cur = 0;
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for (int i = 0; i < BOOT_PD_NUM; i++) {
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boot_pd[i].attr = VMPD_ATTR_P | VMPD_ATTR_AO_KRW;
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boot_pd[i].paddr = cur;
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boot_pd[i].vaddr = MEM_DIRECTMAP_BASE + cur;
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cur += (1 << REGION_DMAP_PGSHIFT);
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vm_insert_pd(&boot_pt, &boot_pd[i], REGION_DMAP_PGSHIFT, (paddr_t)DMVA2PA(&boot_pd[i]));
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}
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// ident map the first 4GB to device memory space
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cur = 0;
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for (int i = 0; i < BOOT_PD_NUM; i++) {
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boot_dev_pd[i].attr = VMPD_ATTR_P | VMPD_ATTR_DEV | VMPD_ATTR_AO_KRW;
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boot_dev_pd[i].paddr = cur;
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boot_dev_pd[i].vaddr = MEM_DIRECTMAP_DEV_BASE + cur;
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cur += (1 << REGION_DMAP_PGSHIFT);
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vm_insert_pd(&boot_pt, &boot_dev_pd[i], REGION_DMAP_PGSHIFT, (paddr_t)DMVA2PA(&boot_dev_pd[i]));
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}
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// set page table base
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paddr_t ptb = (paddr_t)DMVA2PA(&boot_pt);
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int idx = MRT_SET_MPTB_DMAP;
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METAL_MROUTINE_SETARG(MRT_SET_MPTB_ARG_IDX, idx);
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METAL_MROUTINE_SETARG(MRT_SET_MPTB_ARG_PTB, ptb);
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METAL_MENTER(MRT_SET_MPTB_IDX);
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METAL_MROUTINE_GETRET(MRT_SET_MPTB_RET_STATUS, ret);
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if (ret != 0) {
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hlt();
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}
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// set page table attribute override bits
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uint64_t mtp = MTP_KERNEL;
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METAL_MROUTINE_SETARG(MRT_SET_MTP_ARG_MTP, mtp);
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METAL_MENTER(MRT_SET_MTP_IDX);
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// // set MAIR
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// #define MAIR_VAL ((0b11111111) | (0b00000000 << 8))
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// // 0 = b11111111 = Normal, Inner/Outer WB/WA/RA
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// // 1 = b00000000 = Device-nGnRnE
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// __asm__ volatile (
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// "ldr x0, =(" METAL_STR(MAIR_VAL) ");"
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// "msr mair_el1, x0;"
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// :
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// :
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// : "x0"
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// );
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// reset page tables
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uint64_t zero = 0;
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__asm__ volatile (
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"msr ttbr0_el1, %x0;"
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"msr ttbr1_el1, %x0;"
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"TLBI VMALLE1;"
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:
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: "r" (zero)
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:
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);
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} |