413 lines
13 KiB
C
413 lines
13 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 <minix/const.h>
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#include <errno.h>
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#include <assert.h>
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#include <env.h>
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#include <pagetable.h>
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#include "glo.h"
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#include "proto.h"
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#include "util.h"
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#include "vm.h"
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#include "region.h"
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#include "sanitycheck.h"
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#include "memory.h"
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FORWARD _PROTOTYPE( int new_mem, (struct vmproc *vmp, struct vmproc *sh_vmp,
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vir_bytes text_bytes, vir_bytes data_bytes, vir_bytes bss_bytes,
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vir_bytes stk_bytes, phys_bytes tot_bytes) );
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FORWARD _PROTOTYPE( u32_t find_kernel_top, (void));
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/*===========================================================================*
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* find_share *
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*===========================================================================*/
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PUBLIC struct vmproc *find_share(vmp_ign, ino, dev, ctime)
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struct vmproc *vmp_ign; /* process that should not be looked at */
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ino_t ino; /* parameters that uniquely identify a file */
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dev_t dev;
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time_t ctime;
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{
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/* Look for a process that is the file <ino, dev, ctime> in execution. Don't
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* accidentally "find" vmp_ign, because it is the process on whose behalf this
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* call is made.
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*/
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struct vmproc *vmp;
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for (vmp = &vmproc[0]; vmp < &vmproc[NR_PROCS]; vmp++) {
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if (!(vmp->vm_flags & VMF_INUSE)) continue;
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if (!(vmp->vm_flags & VMF_SEPARATE)) continue;
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if (vmp->vm_flags & VMF_HASPT) continue;
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if (vmp == vmp_ign) continue;
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if (vmp->vm_ino != ino) continue;
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if (vmp->vm_dev != dev) continue;
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if (vmp->vm_ctime != ctime) continue;
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return vmp;
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}
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return(NULL);
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}
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/*===========================================================================*
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* exec_newmem *
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*===========================================================================*/
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PUBLIC int do_exec_newmem(message *msg)
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{
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int r, proc_e, proc_n;
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vir_bytes stack_top;
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vir_clicks tc, dc, sc, totc, dvir, s_vir;
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struct vmproc *vmp, *sh_mp;
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char *ptr;
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struct exec_newmem args;
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SANITYCHECK(SCL_FUNCTIONS);
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proc_e= msg->VMEN_ENDPOINT;
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if (vm_isokendpt(proc_e, &proc_n) != OK)
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{
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printf("VM:exec_newmem: bad endpoint %d from %d\n",
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proc_e, msg->m_source);
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return ESRCH;
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}
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vmp= &vmproc[proc_n];
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ptr= msg->VMEN_ARGSPTR;
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if(msg->VMEN_ARGSSIZE != sizeof(args)) {
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printf("VM:exec_newmem: args size %d != %ld\n",
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msg->VMEN_ARGSSIZE, sizeof(args));
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return EINVAL;
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}
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SANITYCHECK(SCL_DETAIL);
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r= sys_datacopy(msg->m_source, (vir_bytes)ptr,
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SELF, (vir_bytes)&args, sizeof(args));
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if (r != OK)
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vm_panic("exec_newmem: sys_datacopy failed", r);
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/* Check to see if segment sizes are feasible. */
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tc = ((unsigned long) args.text_bytes + CLICK_SIZE - 1) >> CLICK_SHIFT;
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dc = (args.data_bytes+args.bss_bytes + CLICK_SIZE - 1) >> CLICK_SHIFT;
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totc = (args.tot_bytes + CLICK_SIZE - 1) >> CLICK_SHIFT;
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sc = (args.args_bytes + CLICK_SIZE - 1) >> CLICK_SHIFT;
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if (dc >= totc) return(ENOEXEC); /* stack must be at least 1 click */
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dvir = (args.sep_id ? 0 : tc);
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s_vir = dvir + (totc - sc);
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r = (dvir + dc > s_vir) ? ENOMEM : OK;
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if (r != OK)
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return r;
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/* Can the process' text be shared with that of one already running? */
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if(!vm_paged) {
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sh_mp = find_share(vmp, args.st_ino, args.st_dev, args.st_ctime);
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} else {
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sh_mp = NULL;
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}
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/* Allocate new memory and release old memory. Fix map and tell
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* kernel.
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*/
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r = new_mem(vmp, sh_mp, args.text_bytes, args.data_bytes,
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args.bss_bytes, args.args_bytes, args.tot_bytes);
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if (r != OK) return(r);
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/* Save file identification to allow it to be shared. */
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vmp->vm_ino = args.st_ino;
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vmp->vm_dev = args.st_dev;
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vmp->vm_ctime = args.st_ctime;
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stack_top= ((vir_bytes)vmp->vm_arch.vm_seg[S].mem_vir << CLICK_SHIFT) +
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((vir_bytes)vmp->vm_arch.vm_seg[S].mem_len << CLICK_SHIFT);
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/* set/clear separate I&D flag */
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if (args.sep_id)
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vmp->vm_flags |= VMF_SEPARATE;
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else
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vmp->vm_flags &= ~VMF_SEPARATE;
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msg->VMEN_STACK_TOP = (void *) stack_top;
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msg->VMEN_FLAGS = 0;
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if (!sh_mp) /* Load text if sh_mp = NULL */
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msg->VMEN_FLAGS |= EXC_NM_RF_LOAD_TEXT;
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return OK;
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}
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/*===========================================================================*
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* new_mem *
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*===========================================================================*/
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PRIVATE int new_mem(rmp, sh_mp, text_bytes, data_bytes,
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bss_bytes,stk_bytes,tot_bytes)
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struct vmproc *rmp; /* process to get a new memory map */
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struct vmproc *sh_mp; /* text can be shared with this process */
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vir_bytes text_bytes; /* text segment size in bytes */
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vir_bytes data_bytes; /* size of initialized data in bytes */
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vir_bytes bss_bytes; /* size of bss in bytes */
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vir_bytes stk_bytes; /* size of initial stack segment in bytes */
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phys_bytes tot_bytes; /* total memory to allocate, including gap */
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{
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/* Allocate new memory and release the old memory. Change the map and report
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* the new map to the kernel. Zero the new core image's bss, gap and stack.
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*/
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vir_clicks text_clicks, data_clicks, gap_clicks, stack_clicks, tot_clicks;
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phys_bytes bytes, base, bss_offset;
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int s, r2;
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static u32_t kernel_top = 0;
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SANITYCHECK(SCL_FUNCTIONS);
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/* No need to allocate text if it can be shared. */
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if (sh_mp != NULL) {
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text_bytes = 0;
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vm_assert(!vm_paged);
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}
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/* Acquire the new memory. Each of the 4 parts: text, (data+bss), gap,
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* and stack occupies an integral number of clicks, starting at click
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* boundary. The data and bss parts are run together with no space.
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*/
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text_clicks = ((unsigned long) text_bytes + CLICK_SIZE - 1) >> CLICK_SHIFT;
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data_clicks = (data_bytes + bss_bytes + CLICK_SIZE - 1) >> CLICK_SHIFT;
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stack_clicks = (stk_bytes + CLICK_SIZE - 1) >> CLICK_SHIFT;
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tot_clicks = (tot_bytes + CLICK_SIZE - 1) >> CLICK_SHIFT;
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gap_clicks = tot_clicks - data_clicks - stack_clicks;
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if ( (int) gap_clicks < 0) return(ENOMEM);
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SANITYCHECK(SCL_DETAIL);
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/* We've got memory for the new core image. Release the old one. */
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if(rmp->vm_flags & VMF_HASPT) {
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/* Free page table and memory allocated by pagetable functions. */
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rmp->vm_flags &= ~VMF_HASPT;
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free_proc(rmp);
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} else {
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if (find_share(rmp, rmp->vm_ino, rmp->vm_dev, rmp->vm_ctime) == NULL) {
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/* No other process shares the text segment, so free it. */
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FREE_MEM(rmp->vm_arch.vm_seg[T].mem_phys, rmp->vm_arch.vm_seg[T].mem_len);
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}
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/* Free the data and stack segments. */
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FREE_MEM(rmp->vm_arch.vm_seg[D].mem_phys,
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rmp->vm_arch.vm_seg[S].mem_vir
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+ rmp->vm_arch.vm_seg[S].mem_len
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- rmp->vm_arch.vm_seg[D].mem_vir);
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}
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/* We have now passed the point of no return. The old core image has been
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* forever lost, memory for a new core image has been allocated. Set up
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* and report new map.
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*/
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if(vm_paged) {
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vir_bytes hole_clicks;
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if(pt_new(&rmp->vm_pt) != OK)
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vm_panic("exec_newmem: no new pagetable", NO_NUM);
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SANITYCHECK(SCL_DETAIL);
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if(!map_proc_kernel(rmp)) {
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printf("VM: exec: map_proc_kernel failed\n");
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return ENOMEM;
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}
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if(!kernel_top)
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kernel_top = find_kernel_top();
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/* Place text at kernel top. */
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rmp->vm_arch.vm_seg[T].mem_phys = kernel_top;
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rmp->vm_arch.vm_seg[T].mem_vir = 0;
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rmp->vm_arch.vm_seg[T].mem_len = text_clicks;
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rmp->vm_offset = CLICK2ABS(kernel_top);
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vm_assert(!sh_mp);
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/* page mapping flags for code */
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#define TEXTFLAGS (PTF_PRESENT | PTF_USER | PTF_WRITE)
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SANITYCHECK(SCL_DETAIL);
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if(text_clicks > 0) {
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if(!map_page_region(rmp, CLICK2ABS(kernel_top), 0,
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CLICK2ABS(rmp->vm_arch.vm_seg[T].mem_len), 0,
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VR_ANON | VR_WRITABLE, 0)) {
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SANITYCHECK(SCL_DETAIL);
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printf("VM: map_page_region failed (text)\n");
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return(ENOMEM);
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}
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SANITYCHECK(SCL_DETAIL);
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}
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SANITYCHECK(SCL_DETAIL);
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/* Allocate memory for data (including bss, but not including gap
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* or stack), make sure it's cleared, and map it in after text
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* (if any).
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*/
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if(!(rmp->vm_heap = map_page_region(rmp,
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CLICK2ABS(kernel_top + text_clicks), 0,
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CLICK2ABS(data_clicks), 0, VR_ANON | VR_WRITABLE, 0))) {
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printf("VM: exec: map_page_region for data failed\n");
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return ENOMEM;
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}
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map_region_set_tag(rmp->vm_heap, VRT_HEAP);
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/* How many address space clicks between end of data
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* and start of stack?
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* VM_STACKTOP is the first address after the stack, as addressed
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* from within the user process.
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*/
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hole_clicks = VM_STACKTOP >> CLICK_SHIFT;
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hole_clicks -= data_clicks + stack_clicks + gap_clicks;
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if(!map_page_region(rmp,
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CLICK2ABS(kernel_top + text_clicks + data_clicks + hole_clicks),
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0, CLICK2ABS(stack_clicks+gap_clicks), 0,
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VR_ANON | VR_WRITABLE, 0) != OK) {
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vm_panic("map_page_region failed for stack", NO_NUM);
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}
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rmp->vm_arch.vm_seg[D].mem_phys = kernel_top + text_clicks;
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rmp->vm_arch.vm_seg[D].mem_vir = 0;
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rmp->vm_arch.vm_seg[D].mem_len = data_clicks;
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rmp->vm_arch.vm_seg[S].mem_phys = kernel_top +
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text_clicks + data_clicks + gap_clicks + hole_clicks;
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rmp->vm_arch.vm_seg[S].mem_vir = data_clicks + gap_clicks + hole_clicks;
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/* Pretend the stack is the full size of the data segment, so
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* we get a full-sized data segment, up to VM_DATATOP.
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* After sys_newmap(),, change the stack to what we know the
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* stack to be (up to VM_STACKTOP).
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*/
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rmp->vm_arch.vm_seg[S].mem_len = (VM_DATATOP >> CLICK_SHIFT) -
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rmp->vm_arch.vm_seg[S].mem_vir - kernel_top - text_clicks;
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/* Where are we allowed to start using the rest of the virtual
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* address space?
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*/
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rmp->vm_stacktop = VM_STACKTOP;
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/* What is the final size of the data segment in bytes? */
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rmp->vm_arch.vm_data_top =
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(rmp->vm_arch.vm_seg[S].mem_vir +
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rmp->vm_arch.vm_seg[S].mem_len) << CLICK_SHIFT;
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rmp->vm_flags |= VMF_HASPT;
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if((s=sys_newmap(rmp->vm_endpoint, rmp->vm_arch.vm_seg)) != OK) {
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vm_panic("sys_newmap (vm) failed", s);
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}
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/* This is the real stack clicks. */
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rmp->vm_arch.vm_seg[S].mem_len = stack_clicks;
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} else {
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phys_clicks new_base;
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new_base = ALLOC_MEM(text_clicks + tot_clicks, 0);
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if (new_base == NO_MEM) return(ENOMEM);
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if (sh_mp != NULL) {
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/* Share the text segment. */
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rmp->vm_arch.vm_seg[T] = sh_mp->vm_arch.vm_seg[T];
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} else {
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rmp->vm_arch.vm_seg[T].mem_phys = new_base;
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rmp->vm_arch.vm_seg[T].mem_vir = 0;
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rmp->vm_arch.vm_seg[T].mem_len = text_clicks;
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if (text_clicks > 0)
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{
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/* Zero the last click of the text segment. Otherwise the
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* part of that click may remain unchanged.
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*/
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base = (phys_bytes)(new_base+text_clicks-1) << CLICK_SHIFT;
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if ((s= sys_memset(0, base, CLICK_SIZE)) != OK)
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vm_panic("new_mem: sys_memset failed", s);
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}
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}
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/* No paging stuff. */
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rmp->vm_flags &= ~VMF_HASPT;
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rmp->vm_regions = NULL;
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rmp->vm_arch.vm_seg[D].mem_phys = new_base + text_clicks;
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rmp->vm_arch.vm_seg[D].mem_vir = 0;
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rmp->vm_arch.vm_seg[D].mem_len = data_clicks;
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rmp->vm_arch.vm_seg[S].mem_phys = rmp->vm_arch.vm_seg[D].mem_phys +
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data_clicks + gap_clicks;
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rmp->vm_arch.vm_seg[S].mem_vir = rmp->vm_arch.vm_seg[D].mem_vir +
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data_clicks + gap_clicks;
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rmp->vm_arch.vm_seg[S].mem_len = stack_clicks;
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rmp->vm_stacktop =
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CLICK2ABS(rmp->vm_arch.vm_seg[S].mem_vir +
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rmp->vm_arch.vm_seg[S].mem_len);
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rmp->vm_arch.vm_data_top =
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(rmp->vm_arch.vm_seg[S].mem_vir +
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rmp->vm_arch.vm_seg[S].mem_len) << CLICK_SHIFT;
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if((r2=sys_newmap(rmp->vm_endpoint, rmp->vm_arch.vm_seg)) != OK) {
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/* report new map to the kernel */
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vm_panic("sys_newmap failed", r2);
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}
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/* Zero the bss, gap, and stack segment. */
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bytes = (phys_bytes)(data_clicks + gap_clicks + stack_clicks) << CLICK_SHIFT;
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base = (phys_bytes) rmp->vm_arch.vm_seg[D].mem_phys << CLICK_SHIFT;
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bss_offset = (data_bytes >> CLICK_SHIFT) << CLICK_SHIFT;
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base += bss_offset;
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bytes -= bss_offset;
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if ((s=sys_memset(0, base, bytes)) != OK) {
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vm_panic("new_mem can't zero", s);
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}
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}
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/* Whether vm_pt is NULL or a new pagetable, tell kernel about it. */
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if((s=pt_bind(&rmp->vm_pt, rmp)) != OK)
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vm_panic("exec_newmem: pt_bind failed", s);
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SANITYCHECK(SCL_FUNCTIONS);
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return(OK);
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}
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/*===========================================================================*
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* find_kernel_top *
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*===========================================================================*/
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PRIVATE u32_t find_kernel_top(void)
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{
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/* Find out where the kernel is, so we know where to start mapping
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* user processes.
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*/
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u32_t kernel_top = 0;
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#define MEMTOP(v, i) \
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(vmproc[v].vm_arch.vm_seg[i].mem_phys + vmproc[v].vm_arch.vm_seg[i].mem_len)
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vm_assert(vmproc[VMP_SYSTEM].vm_flags & VMF_INUSE);
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kernel_top = MEMTOP(VMP_SYSTEM, T);
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kernel_top = MAX(kernel_top, MEMTOP(VMP_SYSTEM, D));
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kernel_top = MAX(kernel_top, MEMTOP(VMP_SYSTEM, S));
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vm_assert(kernel_top);
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return kernel_top;
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}
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