minix/kernel/system/sysctl.c

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#include "../kernel.h"
#include "../ipc.h"
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#include "../system.h"
#include "../protect.h"
#include <sys/svrctl.h>
#include "../sendmask.h"
/* The system call implemented in this file:
* m_type: SYS_SVRCTL
*
* The parameters for this system call are:
* m2_i1: CTL_PROC_NR (process number of caller)
* m2_i2: CTL_REQUEST (request type)
* m2_i3: CTL_MM_PRIV (privilege)
* m2_l1: CTL_SEND_MASK (new send mask to be installed)
* m2_l2: CTL_PROC_TYPE (new process type)
* m2_p1: CTL_ARG_PTR (argument pointer)
*/
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/* NOTE: this call will radically change! */
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/*===========================================================================*
* do_svrctl *
*===========================================================================*/
PUBLIC int do_svrctl(m_ptr)
message *m_ptr; /* pointer to request message */
{
register struct proc *rp;
int proc_nr, priv;
int request;
vir_bytes argp;
/* Extract message parameters. */
proc_nr = m_ptr->CTL_PROC_NR;
if (proc_nr == SELF) proc_nr = m_ptr->m_source;
if (! isokprocn(proc_nr)) return(EINVAL);
request = m_ptr->CTL_REQUEST;
priv = m_ptr->CTL_MM_PRIV;
argp = (vir_bytes) m_ptr->CTL_ARG_PTR;
rp = proc_addr(proc_nr);
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/* Check if the PM privileges are super user. */
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if (!priv || !isuserp(rp))
return(EPERM);
/* See what is requested and handle the request. */
switch (request) {
case SYSSIGNON: {
/* Make this process a server. The system processes should be able
* to communicate with this new server, so update their send masks
* as well.
*/
/* fall through */
}
case SYSSENDMASK: {
rp->p_call_mask = SYSTEM_CALL_MASK;
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rp->p_sendmask = ALLOW_ALL_MASK;
send_mask_allow(proc_addr(USR8139)->p_sendmask, proc_nr);
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send_mask_allow(proc_addr(PM_PROC_NR)->p_sendmask, proc_nr);
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send_mask_allow(proc_addr(FS_PROC_NR)->p_sendmask, proc_nr);
send_mask_allow(proc_addr(IS_PROC_NR)->p_sendmask, proc_nr);
send_mask_allow(proc_addr(CLOCK)->p_sendmask, proc_nr);
send_mask_allow(proc_addr(SYSTASK)->p_sendmask, proc_nr);
send_mask_allow(proc_addr(FXP)->p_sendmask, proc_nr);
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return(OK);
}
default:
return(EINVAL);
}
}
/* The system call implemented in this file:
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* m_type: SYS_SEGCTL
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*
* The parameters for this system call are:
* m4_l3: SEG_PHYS (physical base address)
* m4_l4: SEG_SIZE (size of segment)
* m4_l1: SEG_SELECT (return segment selector here)
* m4_l2: SEG_OFFSET (return offset within segment here)
* m4_l5: SEG_INDEX (return index into remote memory map here)
*
* Author:
* Jorrit N. Herder <jnherder@cs.vu.nl>
*/
/*===========================================================================*
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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 */
{
/* Return a segment selector and offset that can be used to reach a physical
* address, for use by a driver doing memory I/O in the A0000 - DFFFF range.
*/
u16_t selector;
vir_bytes offset;
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int i, index;
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register struct proc *rp;
phys_bytes phys = (phys_bytes) m_ptr->SEG_PHYS;
vir_bytes size = (vir_bytes) m_ptr->SEG_SIZE;
int result;
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/* First check if there is a slot available for this segment. */
rp = proc_addr(m_ptr->m_source);
index = -1;
for (i=0; i < NR_REMOTE_SEGS; i++) {
if (! rp->p_farmem[i].in_use) {
index = i;
rp->p_farmem[i].in_use = TRUE;
rp->p_farmem[i].mem_phys = phys;
rp->p_farmem[i].mem_len = size;
break;
}
}
if (index < 0) return(ENOSPC);
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if (! machine.protected) {
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selector = phys / HCLICK_SIZE;
offset = phys % HCLICK_SIZE;
result = OK;
} else {
/* Check if the segment size can be recorded in bytes, that is, check
* if descriptor's limit field can delimited the allowed memory region
* precisely. This works up to 1MB. If the size is larger, 4K pages
* instead of bytes are used.
*/
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;
result = OK;
} 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;
result = OK;
}
}
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/* Request successfully done. Now return the result. */
m_ptr->SEG_INDEX = index | REMOTE_SEG;
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m_ptr->SEG_SELECT = selector;
m_ptr->SEG_OFFSET = offset;
return(result);
}
/* The system call implemented in this file:
* m_type: SYS_IOPENABLE
*
* The parameters for this system call are:
* m2_i2: PROC_NR (process to give I/O Protection Level bits)
*
* Author:
* Jorrit N. Herder <jnherder@cs.vu.nl>
*/
/*===========================================================================*
* do_iopenable *
*===========================================================================*/
PUBLIC int do_iopenable(m_ptr)
register message *m_ptr; /* pointer to request message */
{
#if ENABLE_USERPRIV && ENABLE_USERIOPL
enable_iop(proc_addr(m_ptr->PROC_NR));
return(OK);
#else
return(EPERM);
#endif
}