198c976f7e
that passes signal map along. This mechanisms is also used for nonuser signals like SIGKMESS, SIGKSTOP, SIGKSIG. Revised comments of many system call handlers. Renamed setpriority to nice.
85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
/* The system call implemented in this file:
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* m_type: SYS_SEGCTL
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*
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* The parameters for this system call are:
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* m4_l3: SEG_PHYS (physical base address)
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* m4_l4: SEG_SIZE (size of segment)
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* m4_l1: SEG_SELECT (return segment selector here)
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* m4_l2: SEG_OFFSET (return offset within segment here)
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* m4_l5: SEG_INDEX (return index into remote memory map here)
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*
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* Author:
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* Jorrit N. Herder <jnherder@cs.vu.nl>
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*/
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#include "../system.h"
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#include "../protect.h"
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#if USE_SEGCTL
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/*===========================================================================*
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* do_segctl *
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*===========================================================================*/
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PUBLIC int do_segctl(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Return a segment selector and offset that can be used to reach a physical
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* address, for use by a driver doing memory I/O in the A0000 - DFFFF range.
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*/
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u16_t selector;
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vir_bytes offset;
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int i, index;
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register struct proc *rp;
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phys_bytes phys = (phys_bytes) m_ptr->SEG_PHYS;
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vir_bytes size = (vir_bytes) m_ptr->SEG_SIZE;
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int result;
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/* First check if there is a slot available for this segment. */
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rp = proc_addr(m_ptr->m_source);
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index = -1;
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for (i=0; i < NR_REMOTE_SEGS; i++) {
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if (! rp->p_priv->s_farmem[i].in_use) {
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index = i;
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rp->p_priv->s_farmem[i].in_use = TRUE;
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rp->p_priv->s_farmem[i].mem_phys = phys;
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rp->p_priv->s_farmem[i].mem_len = size;
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break;
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}
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}
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if (index < 0) return(ENOSPC);
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if (! machine.protected) {
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selector = phys / HCLICK_SIZE;
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offset = phys % HCLICK_SIZE;
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result = OK;
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} else {
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/* Check if the segment size can be recorded in bytes, that is, check
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* if descriptor's limit field can delimited the allowed memory region
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* precisely. This works up to 1MB. If the size is larger, 4K pages
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* instead of bytes are used.
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*/
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if (size < BYTE_GRAN_MAX) {
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init_dataseg(&rp->p_ldt[EXTRA_LDT_INDEX+i], phys, size,
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USER_PRIVILEGE);
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selector = ((EXTRA_LDT_INDEX+i)*0x08) | (1*0x04) | USER_PRIVILEGE;
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offset = 0;
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result = OK;
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} else {
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init_dataseg(&rp->p_ldt[EXTRA_LDT_INDEX+i], phys & ~0xFFFF, 0,
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USER_PRIVILEGE);
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selector = ((EXTRA_LDT_INDEX+i)*0x08) | (1*0x04) | USER_PRIVILEGE;
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offset = phys & 0xFFFF;
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result = OK;
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}
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}
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/* Request successfully done. Now return the result. */
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m_ptr->SEG_INDEX = index | REMOTE_SEG;
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m_ptr->SEG_SELECT = selector;
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m_ptr->SEG_OFFSET = offset;
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return(result);
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}
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#endif /* USE_SEGCTL */
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