69dc6a4f15
Keep kernel and modules in the first 256MB of memory in preparation for the beaglebone. That target only has 256 MB of memory. Change-Id: I3d92247b5d4e5d3aab7388fe01c2f5713d6a4593
300 lines
8.5 KiB
C
300 lines
8.5 KiB
C
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#define UNPAGED 1 /* for proper kmain() prototype */
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#include "kernel/kernel.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <minix/minlib.h>
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#include <minix/const.h>
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#include <minix/type.h>
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#include <minix/com.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <minix/reboot.h>
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#include "string.h"
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#include "arch_proto.h"
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#include "libexec.h"
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#include "direct_utils.h"
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#include "serial.h"
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#include "glo.h"
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#include <machine/multiboot.h>
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#if USE_SYSDEBUG
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#define MULTIBOOT_VERBOSE 1
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#endif
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/* to-be-built kinfo struct, diagnostics buffer */
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kinfo_t kinfo;
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struct kmessages kmessages;
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/* pg_utils.c uses this; in this phase, there is a 1:1 mapping. */
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phys_bytes vir2phys(void *addr) { return (phys_bytes) addr; }
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static void setup_mbi(multiboot_info_t *mbi);
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/* String length used for mb_itoa */
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#define ITOA_BUFFER_SIZE 20
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/* Kernel may use memory */
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int kernel_may_alloc = 1;
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extern u32_t _edata;
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extern u32_t _end;
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static int mb_set_param(char *bigbuf, char *name, char *value, kinfo_t *cbi)
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{
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char *p = bigbuf;
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char *bufend = bigbuf + MULTIBOOT_PARAM_BUF_SIZE;
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char *q;
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int namelen = strlen(name);
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int valuelen = strlen(value);
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/* Some variables we recognize */
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if(!strcmp(name, SERVARNAME)) { cbi->do_serial_debug = 1; }
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if(!strcmp(name, SERBAUDVARNAME)) { cbi->serial_debug_baud = atoi(value); }
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/* Delete the item if already exists */
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while (*p) {
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if (strncmp(p, name, namelen) == 0 && p[namelen] == '=') {
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q = p;
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while (*q) q++;
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for (q++; q < bufend; q++, p++)
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*p = *q;
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break;
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}
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while (*p++)
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;
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p++;
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}
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for (p = bigbuf; p < bufend && (*p || *(p + 1)); p++)
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;
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if (p > bigbuf) p++;
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/* Make sure there's enough space for the new parameter */
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if (p + namelen + valuelen + 3 > bufend)
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return -1;
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strcpy(p, name);
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p[namelen] = '=';
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strcpy(p + namelen + 1, value);
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p[namelen + valuelen + 1] = 0;
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p[namelen + valuelen + 2] = 0;
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return 0;
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}
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int overlaps(multiboot_module_t *mod, int n, int cmp_mod)
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{
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multiboot_module_t *cmp = &mod[cmp_mod];
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int m;
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#define INRANGE(mod, v) ((v) >= mod->mod_start && (v) <= thismod->mod_end)
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#define OVERLAP(mod1, mod2) (INRANGE(mod1, mod2->mod_start) || \
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INRANGE(mod1, mod2->mod_end))
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for(m = 0; m < n; m++) {
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multiboot_module_t *thismod = &mod[m];
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if(m == cmp_mod) continue;
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if(OVERLAP(thismod, cmp))
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return 1;
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}
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return 0;
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}
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/* XXX: hard-coded stuff for modules */
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#define MB_MODS_NR 12
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#define MB_MODS_BASE 0x82000000
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#define MB_PARAM_MOD 0x88000000
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#define MB_MODS_ALIGN 0x00800000 /* 8 MB */
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#define MB_MODS_SIZE 0x00400000 /* 4 MB */
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#define MB_MMAP_START 0x80000000
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#define MB_MMAP_SIZE 0x10000000 /* 256 MB */
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multiboot_module_t mb_modlist[MB_MODS_NR];
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multiboot_memory_map_t mb_memmap;
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void setup_mbi(multiboot_info_t *mbi)
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{
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memset(mbi, 0, sizeof(*mbi));
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mbi->flags = MULTIBOOT_INFO_MODS | MULTIBOOT_INFO_MEM_MAP |
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MULTIBOOT_INFO_CMDLINE;
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mbi->mods_count = MB_MODS_NR;
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mbi->mods_addr = (u32_t)&mb_modlist;
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int i;
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for (i = 0; i < MB_MODS_NR; ++i) {
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mb_modlist[i].mod_start = MB_MODS_BASE + i * MB_MODS_ALIGN;
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mb_modlist[i].mod_end = mb_modlist[i].mod_start + MB_MODS_SIZE ;
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mb_modlist[i].cmdline = 0;
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}
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/* Final 'module' is actually a string holding the boot cmdline */
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mbi->cmdline = MB_PARAM_MOD;
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mbi->mmap_addr =(u32_t)&mb_memmap;
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mbi->mmap_length = sizeof(mb_memmap);
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mb_memmap.size = sizeof(multiboot_memory_map_t);
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mb_memmap.addr = MB_MMAP_START;
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mb_memmap.len = MB_MMAP_SIZE;
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mb_memmap.type = MULTIBOOT_MEMORY_AVAILABLE;
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}
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void get_parameters(u32_t ebx, kinfo_t *cbi)
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{
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multiboot_memory_map_t *mmap;
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multiboot_info_t *mbi = &cbi->mbi;
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int var_i,value_i, m, k;
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char *p;
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extern char _kern_phys_base, _kern_vir_base, _kern_size,
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_kern_unpaged_start, _kern_unpaged_end;
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phys_bytes kernbase = (phys_bytes) &_kern_phys_base,
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kernsize = (phys_bytes) &_kern_size;
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#define BUF 1024
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static char cmdline[BUF];
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/* get our own copy of the multiboot info struct and module list */
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//memcpy((void *) mbi, (void *) ebx, sizeof(*mbi));
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setup_mbi(mbi);
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/* Set various bits of info for the higher-level kernel. */
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cbi->mem_high_phys = 0;
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cbi->user_sp = (vir_bytes) &_kern_vir_base;
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cbi->vir_kern_start = (vir_bytes) &_kern_vir_base;
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cbi->bootstrap_start = (vir_bytes) &_kern_unpaged_start;
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cbi->bootstrap_len = (vir_bytes) &_kern_unpaged_end -
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cbi->bootstrap_start;
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cbi->kmess = &kmess;
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/* set some configurable defaults */
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cbi->do_serial_debug = 1;
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cbi->serial_debug_baud = 115200;
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/* parse boot command line */
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if (mbi->flags&MULTIBOOT_INFO_CMDLINE) {
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static char var[BUF];
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static char value[BUF];
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/* Override values with cmdline argument */
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memcpy(cmdline, (void *) mbi->cmdline, BUF);
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p = cmdline;
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while (*p) {
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var_i = 0;
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value_i = 0;
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while (*p == ' ') p++;
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if (!*p) break;
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while (*p && *p != '=' && *p != ' ' && var_i < BUF - 1)
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var[var_i++] = *p++ ;
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var[var_i] = 0;
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if (*p++ != '=') continue; /* skip if not name=value */
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while (*p && *p != ' ' && value_i < BUF - 1)
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value[value_i++] = *p++ ;
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value[value_i] = 0;
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mb_set_param(cbi->param_buf, var, value, cbi);
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}
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}
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/* let higher levels know what we are booting on */
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mb_set_param(cbi->param_buf, ARCHVARNAME, "earm", cbi);
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/* round user stack down to leave a gap to catch kernel
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* stack overflow; and to distinguish kernel and user addresses
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* at a glance (0xf.. vs 0xe..)
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*/
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cbi->user_sp &= 0xF0000000;
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cbi->user_end = cbi->user_sp;
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/* kernel bytes without bootstrap code/data that is currently
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* still needed but will be freed after bootstrapping.
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*/
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kinfo.kernel_allocated_bytes = (phys_bytes) &_kern_size;
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kinfo.kernel_allocated_bytes -= cbi->bootstrap_len;
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assert(!(cbi->bootstrap_start % ARM_PAGE_SIZE));
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cbi->bootstrap_len = rounddown(cbi->bootstrap_len, ARM_PAGE_SIZE);
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assert(mbi->flags & MULTIBOOT_INFO_MODS);
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assert(mbi->mods_count < MULTIBOOT_MAX_MODS);
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assert(mbi->mods_count > 0);
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memcpy(&cbi->module_list, (void *) mbi->mods_addr,
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mbi->mods_count * sizeof(multiboot_module_t));
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memset(cbi->memmap, 0, sizeof(cbi->memmap));
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/* mem_map has a variable layout */
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if(mbi->flags & MULTIBOOT_INFO_MEM_MAP) {
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cbi->mmap_size = 0;
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for (mmap = (multiboot_memory_map_t *) mbi->mmap_addr;
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(unsigned long) mmap < mbi->mmap_addr + mbi->mmap_length;
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mmap = (multiboot_memory_map_t *)
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((unsigned long) mmap + mmap->size + sizeof(mmap->size))) {
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if(mmap->type != MULTIBOOT_MEMORY_AVAILABLE) continue;
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add_memmap(cbi, mmap->addr, mmap->len);
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}
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} else {
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assert(mbi->flags & MULTIBOOT_INFO_MEMORY);
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add_memmap(cbi, 0, mbi->mem_lower_unused*1024);
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add_memmap(cbi, 0x100000, mbi->mem_upper_unused*1024);
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}
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/* Sanity check: the kernel nor any of the modules may overlap
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* with each other. Pretend the kernel is an extra module for a
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* second.
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*/
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k = mbi->mods_count;
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assert(k < MULTIBOOT_MAX_MODS);
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cbi->module_list[k].mod_start = kernbase;
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cbi->module_list[k].mod_end = kernbase + kernsize;
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cbi->mods_with_kernel = mbi->mods_count+1;
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cbi->kern_mod = k;
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for(m = 0; m < cbi->mods_with_kernel; m++) {
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#if 0
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printf("checking overlap of module %08lx-%08lx\n",
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cbi->module_list[m].mod_start, cbi->module_list[m].mod_end);
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#endif
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if(overlaps(cbi->module_list, cbi->mods_with_kernel, m))
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panic("overlapping boot modules/kernel");
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/* We cut out the bits of memory that we know are
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* occupied by the kernel and boot modules.
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*/
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cut_memmap(cbi,
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cbi->module_list[m].mod_start,
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cbi->module_list[m].mod_end);
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}
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}
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kinfo_t *pre_init(u32_t magic, u32_t ebx)
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{
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/* Clear BSS */
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memset(&_edata, 0, (u32_t)&_end - (u32_t)&_edata);
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omap3_ser_init();
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/* Get our own copy boot params pointed to by ebx.
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* Here we find out whether we should do serial output.
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*/
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get_parameters(ebx, &kinfo);
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/* Make and load a pagetable that will map the kernel
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* to where it should be; but first a 1:1 mapping so
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* this code stays where it should be.
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*/
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pg_clear();
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pg_identity(&kinfo);
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kinfo.freepde_start = pg_mapkernel();
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pg_load();
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vm_enable_paging();
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/* Done, return boot info so it can be passed to kmain(). */
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return &kinfo;
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}
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/* pre_init gets executed at the memory location where the kernel was loaded by the boot loader.
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* at that stage we only have a minium set of functionality present (all symbols gets renamed to
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* ensure this). The following methods are used in that context. Once we jump to kmain they are no
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* longer used and the "real" implementations are visible
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*/
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int send_sig(endpoint_t proc_nr, int sig_nr) { return 0; }
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void minix_shutdown(timer_t *t) { arch_shutdown(RBT_PANIC); }
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void busy_delay_ms(int x) { }
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int raise(int n) { panic("raise(%d)\n", n); }
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