2e293ce7c0
- a better name for architecture specific init function - some of x86 init code must execute in protected mode - prot_init() removed from this function and still called in cstart() Imho this should be called from the architecture specific assembly not cstart. cstart perform Minix monitor specific tasks and will be touched once another bootloader is in use, e.g. booting via tftp, therefore we keep it as is for now. - this is a backport from the SMP code which requires this. Merging will be simpler
108 lines
3.6 KiB
C
Executable file
108 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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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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