minix/kernel/start.c
Ben Gras 6f77685609 Split of architecture-dependent and -independent functions for i386,
mainly in the kernel and headers. This split based on work by
Ingmar Alting <iaalting@cs.vu.nl> done for his Minix PowerPC architecture
port.

 . kernel does not program the interrupt controller directly, do any
   other architecture-dependent operations, or contain assembly any more,
   but uses architecture-dependent functions in arch/$(ARCH)/.
 . architecture-dependent constants and types defined in arch/$(ARCH)/include.
 . <ibm/portio.h> moved to <minix/portio.h>, as they have become, for now,
   architecture-independent functions.
 . int86, sdevio, readbios, and iopenable are now i386-specific kernel calls
   and live in arch/i386/do_* now.
 . i386 arch now supports even less 86 code; e.g. mpx86.s and klib86.s have
   gone, and 'machine.protected' is gone (and always taken to be 1 in i386).
   If 86 support is to return, it should be a new architecture.
 . prototypes for the architecture-dependent functions defined in
   kernel/arch/$(ARCH)/*.c but used in kernel/ are in kernel/proto.h
 . /etc/make.conf included in makefiles and shell scripts that need to
   know the building architecture; it defines ARCH=<arch>, currently only
   i386.
 . some basic per-architecture build support outside of the kernel (lib)
 . in clock.c, only dequeue a process if it was ready
 . fixes for new include files

files deleted:
 . mpx/klib.s - only for choosing between mpx/klib86 and -386
 . klib86.s - only for 86

i386-specific files files moved (or arch-dependent stuff moved) to arch/i386/:
 . mpx386.s (entry point)
 . klib386.s
 . sconst.h
 . exception.c
 . protect.c
 . protect.h
 . i8269.c
2006-12-22 15:22:27 +00:00

105 lines
3.5 KiB
C
Executable file

/* First C file used by the kernel. */
#include "kernel.h"
#include "proc.h"
#include <stdlib.h>
#include <string.h>
#include <archconst.h>
PRIVATE char params[K_PARAM_SIZE];
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;
int h;
/* 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 */
/* Architecture-dependent initialization. */
system_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;
strncpy(kinfo.release, OS_RELEASE, sizeof(kinfo.release));
kinfo.release[sizeof(kinfo.release)-1] = '\0';
strncpy(kinfo.version, OS_VERSION, sizeof(kinfo.version));
kinfo.version[sizeof(kinfo.version)-1] = '\0';
kinfo.proc_addr = (vir_bytes) proc;
kinfo.kmem_base = vir2phys(0);
kinfo.kmem_size = (phys_bytes) &end;
/* Load average data initialization. */
kloadinfo.proc_last_slot = 0;
for(h = 0; h < _LOAD_HISTORY; h++)
kloadinfo.proc_load_history[h] = 0;
/* Processor? Decide if mode is protected for older machines. */
machine.processor=atoi(get_value(params, "processor"));
/* XT, AT or MCA bus? */
value = get_value(params, "bus");
if (value == NIL_PTR || strcmp(value, "at") == 0) {
machine.pc_at = TRUE; /* PC-AT compatible hardware */
} else if (strcmp(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 (strcmp(value, "ega") == 0) machine.vdu_ega = TRUE;
if (strcmp(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().
*/
intr_init(INTS_MINIX);
}
/*===========================================================================*
* 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);
}