116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
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#define _SYSTEM 1
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#include <minix/callnr.h>
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#include <minix/com.h>
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#include <minix/config.h>
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#include <minix/const.h>
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#include <minix/ds.h>
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#include <minix/endpoint.h>
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#include <minix/keymap.h>
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#include <minix/minlib.h>
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#include <minix/type.h>
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#include <minix/ipc.h>
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#include <minix/sysutil.h>
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#include <minix/syslib.h>
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#include <sys/mman.h>
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#include <errno.h>
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#include <env.h>
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#include "../proto.h"
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#include "../vm.h"
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#include "../util.h"
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#include "memory.h"
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#define PAGE_SIZE 4096
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#define PAGE_DIR_SIZE (1024*PAGE_SIZE)
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#define PAGE_TABLE_COVER (1024*PAGE_SIZE)
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/*=========================================================================*
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* arch_init_vm *
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*=========================================================================*/
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PUBLIC void arch_init_vm(mem_chunks)
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struct memory mem_chunks[NR_MEMS];
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{
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phys_bytes high, bytes;
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phys_clicks clicks, base_click;
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unsigned pages;
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int i, r;
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/* Compute the highest memory location */
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high= 0;
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for (i= 0; i<NR_MEMS; i++)
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{
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if (mem_chunks[i].size == 0)
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continue;
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if (mem_chunks[i].base + mem_chunks[i].size > high)
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high= mem_chunks[i].base + mem_chunks[i].size;
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}
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high <<= CLICK_SHIFT;
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#if VERBOSE_VM
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printf("do_x86_vm: found high 0x%x\n", high);
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#endif
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/* Rounding up */
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high= (high-1+PAGE_DIR_SIZE) & ~(PAGE_DIR_SIZE-1);
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/* The number of pages we need is one for the page directory, enough
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* page tables to cover the memory, and one page for alignement.
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*/
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pages= 1 + (high + PAGE_TABLE_COVER-1)/PAGE_TABLE_COVER + 1;
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bytes= pages*PAGE_SIZE;
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clicks= (bytes + CLICK_SIZE-1) >> CLICK_SHIFT;
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#if VERBOSE_VM
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printf("do_x86_vm: need %d pages\n", pages);
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printf("do_x86_vm: need %d bytes\n", bytes);
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printf("do_x86_vm: need %d clicks\n", clicks);
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#endif
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for (i= 0; i<NR_MEMS; i++)
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{
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if (mem_chunks[i].size <= clicks)
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continue;
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break;
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}
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if (i >= NR_MEMS)
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panic("VM", "not enough memory for VM page tables?", NO_NUM);
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base_click= mem_chunks[i].base;
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mem_chunks[i].base += clicks;
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mem_chunks[i].size -= clicks;
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#if VERBOSE_VM
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printf("do_x86_vm: using 0x%x clicks @ 0x%x\n", clicks, base_click);
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#endif
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r= sys_vm_setbuf(base_click << CLICK_SHIFT, clicks << CLICK_SHIFT,
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high);
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if (r != 0)
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printf("do_x86_vm: sys_vm_setbuf failed: %d\n", r);
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}
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/*===========================================================================*
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* arch_map2vir *
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*===========================================================================*/
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PUBLIC vir_bytes arch_map2vir(struct vmproc *vmp, vir_bytes addr)
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{
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vir_bytes bottom = CLICK2ABS(vmp->vm_arch.vm_seg[D].mem_phys);
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vm_assert(bottom <= addr);
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return addr - bottom;
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}
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/*===========================================================================*
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* arch_vir2map *
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*===========================================================================*/
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PUBLIC vir_bytes arch_vir2map(struct vmproc *vmp, vir_bytes addr)
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{
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vir_bytes bottom = CLICK2ABS(vmp->vm_arch.vm_seg[D].mem_phys);
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return addr + bottom;
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}
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