| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* $Id: init.c,v 1.14 2000/01/29 01:09:12 anton Exp $ |
| 2 | * init.c: Initialize internal variables used by the PROM |
| 3 | * library functions. |
| 4 | * |
| 5 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) |
| 6 | * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
| 7 | */ |
| 8 | |
| 9 | #include <linux/config.h> |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/init.h> |
| 12 | |
| 13 | #include <asm/openprom.h> |
| 14 | #include <asm/oplib.h> |
| 15 | #include <asm/sun4prom.h> |
| 16 | |
| 17 | struct linux_romvec *romvec; |
| 18 | enum prom_major_version prom_vers; |
| 19 | unsigned int prom_rev, prom_prev; |
| 20 | linux_sun4_romvec *sun4_romvec; |
| 21 | |
| 22 | /* The root node of the prom device tree. */ |
| 23 | int prom_root_node; |
| 24 | |
| 25 | int prom_stdin, prom_stdout; |
| 26 | |
| 27 | /* Pointer to the device tree operations structure. */ |
| 28 | struct linux_nodeops *prom_nodeops; |
| 29 | |
| 30 | /* You must call prom_init() before you attempt to use any of the |
| 31 | * routines in the prom library. It returns 0 on success, 1 on |
| 32 | * failure. It gets passed the pointer to the PROM vector. |
| 33 | */ |
| 34 | |
| 35 | extern void prom_meminit(void); |
| 36 | extern void prom_ranges_init(void); |
| 37 | |
| 38 | void __init prom_init(struct linux_romvec *rp) |
| 39 | { |
| 40 | #ifdef CONFIG_SUN4 |
| 41 | extern struct linux_romvec *sun4_prom_init(void); |
| 42 | rp = sun4_prom_init(); |
| 43 | #endif |
| 44 | romvec = rp; |
| 45 | |
| 46 | switch(romvec->pv_romvers) { |
| 47 | case 0: |
| 48 | prom_vers = PROM_V0; |
| 49 | break; |
| 50 | case 2: |
| 51 | prom_vers = PROM_V2; |
| 52 | break; |
| 53 | case 3: |
| 54 | prom_vers = PROM_V3; |
| 55 | break; |
| 56 | case 40: |
| 57 | prom_vers = PROM_SUN4; |
| 58 | break; |
| 59 | default: |
| 60 | prom_printf("PROMLIB: Bad PROM version %d\n", |
| 61 | romvec->pv_romvers); |
| 62 | prom_halt(); |
| 63 | break; |
| 64 | }; |
| 65 | |
| 66 | prom_rev = romvec->pv_plugin_revision; |
| 67 | prom_prev = romvec->pv_printrev; |
| 68 | prom_nodeops = romvec->pv_nodeops; |
| 69 | |
| 70 | prom_root_node = prom_getsibling(0); |
| 71 | if((prom_root_node == 0) || (prom_root_node == -1)) |
| 72 | prom_halt(); |
| 73 | |
| 74 | if((((unsigned long) prom_nodeops) == 0) || |
| 75 | (((unsigned long) prom_nodeops) == -1)) |
| 76 | prom_halt(); |
| 77 | |
| 78 | if(prom_vers == PROM_V2 || prom_vers == PROM_V3) { |
| 79 | prom_stdout = *romvec->pv_v2bootargs.fd_stdout; |
| 80 | prom_stdin = *romvec->pv_v2bootargs.fd_stdin; |
| 81 | } |
| 82 | |
| 83 | prom_meminit(); |
| 84 | |
| 85 | prom_ranges_init(); |
| 86 | |
| 87 | #ifndef CONFIG_SUN4 |
| 88 | /* SUN4 prints this in sun4_prom_init */ |
| 89 | printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n", |
| 90 | romvec->pv_romvers, prom_rev); |
| 91 | #endif |
| 92 | |
| 93 | /* Initialization successful. */ |
| 94 | return; |
| 95 | } |