156 lines
4 KiB
C
156 lines
4 KiB
C
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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 "proto.h"
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#ifdef USE_WATCHDOG
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#include "watchdog.h"
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#endif
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/*===========================================================================*
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* cstart *
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*===========================================================================*/
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PUBLIC void cstart(
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u16_t cs, /* kernel code segment */
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u16_t ds, /* kernel data segment */
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u16_t mds, /* monitor data segment */
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u16_t parmoff, /* boot parameters offset */
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u16_t parmsize /* boot parameters length */
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)
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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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#if USE_BOOTPARAM
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/* determine verbosity */
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if ((value = env_get(VERBOSEBOOTVARNAME)))
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verboseboot = atoi(value);
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/* Get clock tick frequency. */
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value = env_get("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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#else /* !USE_BOOTPARAM */
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system_hz = DEFAULT_HZ;
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#endif
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DEBUGEXTRA(("cstart\n"));
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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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#ifdef DEBUG_SERIAL
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/* Intitialize serial debugging */
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value = env_get(SERVARNAME);
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if(value && atoi(value) == 0) {
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do_serial_debug=1;
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value = env_get(SERBAUDVARNAME);
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if (value) serial_debug_baud = atoi(value);
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}
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#endif
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#ifdef USE_APIC
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value = env_get("no_apic");
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if(value)
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config_no_apic = atoi(value);
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else
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config_no_apic = 1;
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value = env_get("apic_timer_x");
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if(value)
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config_apic_timer_x = atoi(value);
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else
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config_apic_timer_x = 1;
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#endif
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#ifdef USE_WATCHDOG
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value = env_get("watchdog");
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if (value)
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watchdog_enabled = atoi(value);
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#endif
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#ifdef CONFIG_SMP
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if (config_no_apic)
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config_no_smp = 1;
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value = env_get("no_smp");
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if(value)
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config_no_smp = atoi(value);
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else
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config_no_smp = 0;
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#endif
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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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DEBUGEXTRA(("intr_init(%d, 0)\n", INTS_MINIX));
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intr_init(INTS_MINIX, 0);
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}
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/*===========================================================================*
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* get_value *
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*===========================================================================*/
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PUBLIC char *get_value(
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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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{
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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(NULL);
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}
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/*===========================================================================*
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* env_get *
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*===========================================================================*/
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PUBLIC char *env_get(const char *name)
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{
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return get_value(params_buffer, name);
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}
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