126 lines
3.8 KiB
C
126 lines
3.8 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_UMAP
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*
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* The parameters for this kernel call are:
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* m5_i1: CP_SRC_PROC_NR (process number)
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* m5_c1: CP_SRC_SPACE (segment where address is: T, D, or S)
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* m5_l1: CP_SRC_ADDR (virtual address)
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* m5_l2: CP_DST_ADDR (returns physical address)
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* m5_l3: CP_NR_BYTES (size of datastructure)
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*/
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#include "../system.h"
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#include "../vm.h"
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#if USE_UMAP
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/*==========================================================================*
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* do_umap *
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*==========================================================================*/
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PUBLIC int do_umap(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Map virtual address to physical, for non-kernel processes. */
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int seg_type = m_ptr->CP_SRC_SPACE & SEGMENT_TYPE;
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int seg_index = m_ptr->CP_SRC_SPACE & SEGMENT_INDEX;
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vir_bytes offset = m_ptr->CP_SRC_ADDR;
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int count = m_ptr->CP_NR_BYTES;
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int endpt = (int) m_ptr->CP_SRC_ENDPT;
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int proc_nr, r;
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int naughty = 0;
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phys_bytes phys_addr = 0, lin_addr = 0;
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int caller_pn;
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struct proc *targetpr, *caller;
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/* Verify process number. */
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if (endpt == SELF)
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proc_nr = who_p;
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else
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if (! isokendpt(endpt, &proc_nr))
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return(EINVAL);
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targetpr = proc_addr(proc_nr);
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okendpt(who_e, &caller_pn);
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caller = proc_addr(caller_pn);
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/* See which mapping should be made. */
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switch(seg_type) {
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case LOCAL_SEG:
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phys_addr = lin_addr = umap_local(targetpr, seg_index, offset, count);
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if(!lin_addr) return EFAULT;
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CHECKRANGE_OR_SUSPEND(targetpr, lin_addr, count, 1);
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naughty = 1;
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break;
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case REMOTE_SEG:
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phys_addr = lin_addr = umap_remote(targetpr, seg_index, offset, count);
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if(!lin_addr) return EFAULT;
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CHECKRANGE_OR_SUSPEND(targetpr, lin_addr, count, 1);
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naughty = 1;
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break;
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case GRANT_SEG:
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naughty = 1;
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case LOCAL_VM_SEG:
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if(seg_index == MEM_GRANT || seg_type == GRANT_SEG) {
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vir_bytes newoffset;
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endpoint_t newep;
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int new_proc_nr;
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if(verify_grant(targetpr->p_endpoint, ANY, offset, count, 0, 0,
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&newoffset, &newep) != OK) {
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kprintf("SYSTEM: do_umap: verify_grant in %s, grant %d, bytes 0x%lx, failed, caller %s\n", targetpr->p_name, offset, count, caller->p_name);
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proc_stacktrace(caller);
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return EFAULT;
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}
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if(!isokendpt(newep, &new_proc_nr)) {
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kprintf("SYSTEM: do_umap: isokendpt failed\n");
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return EFAULT;
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}
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/* New lookup. */
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offset = newoffset;
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targetpr = proc_addr(new_proc_nr);
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seg_index = D;
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}
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if(seg_index == T || seg_index == D || seg_index == S) {
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phys_addr = lin_addr = umap_local(targetpr, seg_index, offset, count);
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} else {
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kprintf("SYSTEM: bogus seg type 0x%lx\n", seg_index);
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return EFAULT;
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}
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if(!lin_addr) {
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kprintf("SYSTEM:do_umap: umap_local failed\n");
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return EFAULT;
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}
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CHECKRANGE_OR_SUSPEND(targetpr, lin_addr, count, 1);
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if(vm_lookup(targetpr, lin_addr, &phys_addr, NULL) != OK) {
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kprintf("SYSTEM:do_umap: vm_lookup failed\n");
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return EFAULT;
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}
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if(phys_addr == 0)
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minix_panic("vm_lookup returned zero physical address", NO_NUM);
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break;
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default:
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if((r=arch_umap(targetpr, offset, count, seg_type, &lin_addr))
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!= OK)
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return r;
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phys_addr = lin_addr;
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}
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if(vm_running && !vm_contiguous(targetpr, lin_addr, count)) {
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kprintf("SYSTEM:do_umap: not contiguous\n");
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return EFAULT;
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}
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m_ptr->CP_DST_ADDR = phys_addr;
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if(naughty || phys_addr == 0) {
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kprintf("kernel: umap 0x%x done by %d / %s, pc 0x%lx, 0x%lx -> 0x%lx\n",
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seg_type, who_e, caller->p_name, caller->p_reg.pc, offset, phys_addr);
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kprintf("caller stack: ");
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proc_stacktrace(caller);
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}
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return (phys_addr == 0) ? EFAULT: OK;
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}
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#endif /* USE_UMAP */
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