24e1e83028
debugging info on panic: decode segment selectors and descriptors, now moved to arch-specific part, prototypes added; sanity checking in debug.h made optional with vmassert().
109 lines
3.6 KiB
C
Executable file
109 lines
3.6 KiB
C
Executable file
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/* First C file used by the kernel. */
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#include "kernel.h"
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#include "proc.h"
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#include <stdlib.h>
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#include <string.h>
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#include <archconst.h>
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#include <proto.h>
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FORWARD _PROTOTYPE( char *get_value, (_CONST char *params, _CONST char *key));
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/*===========================================================================*
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* cstart *
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*===========================================================================*/
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PUBLIC void cstart(cs, ds, mds, parmoff, parmsize)
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U16_t cs, ds; /* kernel code and data segment */
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U16_t mds; /* monitor data segment */
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U16_t parmoff, parmsize; /* boot parameters offset and length */
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{
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/* Perform system initializations prior to calling main(). Most settings are
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* determined with help of the environment strings passed by MINIX' loader.
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*/
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register char *value; /* value in key=value pair */
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extern int etext, end;
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int h;
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/* Record where the kernel and the monitor are. */
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kinfo.code_base = seg2phys(cs);
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kinfo.code_size = (phys_bytes) &etext; /* size of code segment */
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kinfo.data_base = seg2phys(ds);
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kinfo.data_size = (phys_bytes) &end; /* size of data segment */
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/* protection initialization */
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prot_init();
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/* Copy the boot parameters to the local buffer. */
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arch_get_params(params_buffer, sizeof(params_buffer));
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/* Record miscellaneous information for user-space servers. */
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kinfo.nr_procs = NR_PROCS;
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kinfo.nr_tasks = NR_TASKS;
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strncpy(kinfo.release, OS_RELEASE, sizeof(kinfo.release));
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kinfo.release[sizeof(kinfo.release)-1] = '\0';
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strncpy(kinfo.version, OS_VERSION, sizeof(kinfo.version));
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kinfo.version[sizeof(kinfo.version)-1] = '\0';
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kinfo.proc_addr = (vir_bytes) proc;
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/* Load average data initialization. */
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kloadinfo.proc_last_slot = 0;
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for(h = 0; h < _LOAD_HISTORY; h++)
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kloadinfo.proc_load_history[h] = 0;
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/* Processor? Decide if mode is protected for older machines. */
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machine.processor=atoi(get_value(params_buffer, "processor"));
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/* XT, AT or MCA bus? */
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value = get_value(params_buffer, "bus");
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if (value == NIL_PTR || strcmp(value, "at") == 0) {
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machine.pc_at = TRUE; /* PC-AT compatible hardware */
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} else if (strcmp(value, "mca") == 0) {
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machine.pc_at = machine.ps_mca = TRUE; /* PS/2 with micro channel */
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}
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/* Type of VDU: */
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value = get_value(params_buffer, "video"); /* EGA or VGA video unit */
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if (strcmp(value, "ega") == 0) machine.vdu_ega = TRUE;
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if (strcmp(value, "vga") == 0) machine.vdu_vga = machine.vdu_ega = TRUE;
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/* Get clock tick frequency. */
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value = get_value(params_buffer, "hz");
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if(value)
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system_hz = atoi(value);
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if(!value || system_hz < 2 || system_hz > 50000) /* sanity check */
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system_hz = DEFAULT_HZ;
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value = get_value(params_buffer, SERVARNAME);
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if(value && atoi(value) == 0)
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do_serial_debug=1;
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/* Return to assembler code to switch to protected mode (if 286),
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* reload selectors and call main().
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*/
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intr_init(INTS_MINIX);
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}
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/*===========================================================================*
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* get_value *
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*===========================================================================*/
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PRIVATE char *get_value(params, name)
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_CONST char *params; /* boot monitor parameters */
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_CONST char *name; /* key to look up */
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{
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/* Get environment value - kernel version of getenv to avoid setting up the
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* usual environment array.
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*/
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register _CONST char *namep;
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register char *envp;
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for (envp = (char *) params; *envp != 0;) {
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for (namep = name; *namep != 0 && *namep == *envp; namep++, envp++)
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;
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if (*namep == '\0' && *envp == '=') return(envp + 1);
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while (*envp++ != 0)
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;
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}
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return(NIL_PTR);
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}
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