ref: 8be7f27b758ef9ef818f68db0d8bcb7b038eae0e
dir: /sys/src/9/arm64/mem.c/
#include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #define INITMAP (ROUND((uintptr)end + BY2PG, PGLSZ(1))-KZERO) /* * Create initial identity map in top-level page table * (L1BOT) for TTBR0. This page table is only used until * mmu1init() loads m->mmutop. */ void mmuidmap(uintptr *l1bot) { uintptr pa, pe, attr; /* VDRAM */ attr = PTEWRITE | PTEAF | PTEKERNEL | PTEUXN | PTESH(SHARE_INNER); pe = -KZERO; for(pa = VDRAM - KZERO; pa < pe; pa += PGLSZ(PTLEVELS-1)) l1bot[PTLX(pa, PTLEVELS-1)] = pa | PTEVALID | PTEBLOCK | attr; } /* * Create initial shared kernel page table (L1) for TTBR1. * This page table coveres the INITMAP and VIRTIO, * and later we fill the ram mappings in meminit(). */ void mmu0init(uintptr *l1) { uintptr va, pa, pe, attr; /* DRAM - INITMAP */ attr = PTEWRITE | PTEAF | PTEKERNEL | PTEUXN | PTESH(SHARE_INNER); pe = INITMAP; for(pa = VDRAM - KZERO, va = VDRAM; pa < pe; pa += PGLSZ(1), va += PGLSZ(1)) l1[PTL1X(va, 1)] = pa | PTEVALID | PTEBLOCK | attr; /* VIRTIO */ attr = PTEWRITE | PTEAF | PTEKERNEL | PTEUXN | PTEPXN | PTESH(SHARE_OUTER) | PTEDEVICE; pe = PHYSIOEND; for(pa = PHYSIO, va = VIRTIO; pa < pe; pa += PGLSZ(1), va += PGLSZ(1)){ if(((pa|va) & PGLSZ(1)-1) != 0){ l1[PTL1X(va, 1)] = (uintptr)l1 | PTEVALID | PTETABLE; for(; pa < pe && ((va|pa) & PGLSZ(1)-1) != 0; pa += PGLSZ(0), va += PGLSZ(0)){ assert(l1[PTLX(va, 0)] == 0); l1[PTLX(va, 0)] = pa | PTEVALID | PTEPAGE | attr; } break; } l1[PTL1X(va, 1)] = pa | PTEVALID | PTEBLOCK | attr; } if(PTLEVELS > 2) for(va = KSEG0; va != 0; va += PGLSZ(2)) l1[PTL1X(va, 2)] = (uintptr)&l1[L1TABLEX(va, 1)] | PTEVALID | PTETABLE; if(PTLEVELS > 3) for(va = KSEG0; va != 0; va += PGLSZ(3)) l1[PTL1X(va, 3)] = (uintptr)&l1[L1TABLEX(va, 2)] | PTEVALID | PTETABLE; } void meminit(void) { char *p; uintptr l = GiB + 128 * MiB; if(p = getconf("*maxmem")) l = strtoull(p, 0, 0); conf.mem[0].base = PGROUND((uintptr)end - KZERO); conf.mem[0].limit = l; if(l > KLIMIT) l = KLIMIT; kmapram(conf.mem[0].base, l); conf.mem[0].npage = (conf.mem[0].limit - conf.mem[0].base)/BY2PG; }