a408699ce0
Removed stop sequence when MINIX is shut down. Disabled send mask checks --- to be replaced by proper mechanism. Fixed bug relating to 'shutdown -x'. Simplified clock accounting of realtime. Updated Makefiles for mkdept script.
114 lines
4.0 KiB
C
Executable File
114 lines
4.0 KiB
C
Executable File
/* This file contains the C startup code for Minix on Intel processors.
|
|
* It cooperates with mpx.s to set up a good environment for main().
|
|
*
|
|
* This code runs in real mode for a 16 bit kernel and may have to switch
|
|
* to protected mode for a 286.
|
|
* For a 32 bit kernel this already runs in protected mode, but the selectors
|
|
* are still those given by the BIOS with interrupts disabled, so the
|
|
* descriptors need to be reloaded and interrupt descriptors made.
|
|
*/
|
|
|
|
#include "kernel.h"
|
|
#include "protect.h"
|
|
#include "proc.h"
|
|
|
|
FORWARD _PROTOTYPE( char *get_value, (_CONST char *params, _CONST char *key));
|
|
|
|
/*==========================================================================*
|
|
* cstart *
|
|
*==========================================================================*/
|
|
PUBLIC void cstart(cs, ds, mds, parmoff, parmsize)
|
|
U16_t cs, ds; /* kernel code and data segment */
|
|
U16_t mds; /* monitor data segment */
|
|
U16_t parmoff, parmsize; /* boot parameters offset and length */
|
|
{
|
|
/* Perform system initializations prior to calling main(). Most settings are
|
|
* determined with help of the environment strings passed by MINIX' loader.
|
|
*/
|
|
char params[128*sizeof(char *)]; /* boot monitor parameters */
|
|
register char *value; /* value in key=value pair */
|
|
extern int etext, end;
|
|
|
|
/* Decide if mode is protected; 386 or higher implies protected mode.
|
|
* This must be done first, because it is needed for, e.g., seg2phys().
|
|
* For 286 machines we cannot decide on protected mode, yet. This is
|
|
* done below.
|
|
*/
|
|
#if _WORD_SIZE != 2
|
|
machine.protected = 1;
|
|
#endif
|
|
|
|
/* Record where the kernel and the monitor are. */
|
|
kinfo.code_base = seg2phys(cs);
|
|
kinfo.code_size = (phys_bytes) &etext; /* size of code segment */
|
|
kinfo.data_base = seg2phys(ds);
|
|
kinfo.data_size = (phys_bytes) &end; /* size of data segment */
|
|
|
|
/* Initialize protected mode descriptors. */
|
|
prot_init();
|
|
|
|
/* Copy the boot parameters to the local buffer. */
|
|
kinfo.params_base = seg2phys(mds) + parmoff;
|
|
kinfo.params_size = MIN(parmsize,sizeof(params)-2);
|
|
phys_copy(kinfo.params_base, vir2phys(params), kinfo.params_size);
|
|
|
|
/* Record miscellaneous information for user-space servers. */
|
|
kinfo.nr_procs = NR_PROCS;
|
|
kinfo.nr_tasks = NR_TASKS;
|
|
kstrncpy(kinfo.release, OS_RELEASE, 4);
|
|
kstrncpy(kinfo.version, OS_VERSION, 4);
|
|
kinfo.proc_addr = (vir_bytes) proc;
|
|
kinfo.kmem_base = vir2phys(0);
|
|
kinfo.kmem_size = (phys_bytes) &end;
|
|
|
|
/* Processor? 86, 186, 286, 386, ... */
|
|
machine.processor=katoi(get_value(params, "processor"));
|
|
|
|
/* Decide if mode is protected for older machines. */
|
|
#if _WORD_SIZE == 2
|
|
machine.protected = machine.processor >= 286;
|
|
#endif
|
|
if (! machine.protected) mon_return = 0;
|
|
|
|
/* XT, AT or MCA bus? */
|
|
value = get_value(params, "bus");
|
|
if (value == NIL_PTR || kstrcmp(value, "at") == 0) {
|
|
machine.pc_at = TRUE; /* PC-AT compatible hardware */
|
|
} else if (kstrcmp(value, "mca") == 0) {
|
|
machine.pc_at = machine.ps_mca = TRUE; /* PS/2 with micro channel */
|
|
}
|
|
|
|
/* Type of VDU: */
|
|
value = get_value(params, "video"); /* EGA or VGA video unit */
|
|
if (kstrcmp(value, "ega") == 0) machine.vdu_ega = TRUE;
|
|
if (kstrcmp(value, "vga") == 0) machine.vdu_vga = machine.vdu_ega = TRUE;
|
|
|
|
/* Return to assembler code to switch to protected mode (if 286),
|
|
* reload selectors and call main().
|
|
*/
|
|
}
|
|
|
|
|
|
/*==========================================================================*
|
|
* get_value *
|
|
*==========================================================================*/
|
|
PRIVATE char *get_value(params, name)
|
|
_CONST char *params; /* boot monitor parameters */
|
|
_CONST char *name; /* key to look up */
|
|
{
|
|
/* Get environment value - kernel version of getenv to avoid setting up the
|
|
* usual environment array.
|
|
*/
|
|
register _CONST char *namep;
|
|
register char *envp;
|
|
|
|
for (envp = (char *) params; *envp != 0;) {
|
|
for (namep = name; *namep != 0 && *namep == *envp; namep++, envp++)
|
|
;
|
|
if (*namep == '\0' && *envp == '=') return(envp + 1);
|
|
while (*envp++ != 0)
|
|
;
|
|
}
|
|
return(NIL_PTR);
|
|
}
|