9ba760e603
ask to map in oxpcie i/o memory and support serial i/o for it in the kernel. set oxpcie=<address> in boot monitor (retrieve address using pci_debug=1 output). (no sanity checking is done on the address currently.) disabled by default. The change also contains some other minor cleanup (a new serial.h to set register info common to UART and the OXPCIe card, in-kernel memory mapping a little more structured and env_get() to get sysenv variables without knowing about the params_buffer).
145 lines
4.1 KiB
C
145 lines
4.1 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 CONFIG_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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/* determine verbosity */
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if ((value = env_get(VERBOSEBOOTVARNAME)))
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verboseboot = atoi(value);
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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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/* Processor? Decide if mode is protected for older machines. */
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machine.processor=atoi(env_get("processor"));
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/* XT, AT or MCA bus? */
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value = env_get("bus");
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if (value == NULL || 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 = env_get("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 = 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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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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#ifdef CONFIG_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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#endif
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#ifdef CONFIG_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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/* 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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PRIVATE 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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