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1da177e4 LT |
1 | /* |
2 | * arch/alpha/boot/main.c | |
3 | * | |
4 | * Copyright (C) 1994, 1995 Linus Torvalds | |
5 | * | |
6 | * This file is the bootloader for the Linux/AXP kernel | |
7 | */ | |
8 | #include <linux/kernel.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
1da177e4 | 10 | #include <linux/string.h> |
273b281f | 11 | #include <generated/utsrelease.h> |
1da177e4 LT |
12 | #include <linux/mm.h> |
13 | ||
1da177e4 LT |
14 | #include <asm/console.h> |
15 | #include <asm/hwrpb.h> | |
16 | #include <asm/pgtable.h> | |
17 | ||
18 | #include <stdarg.h> | |
19 | ||
20 | #include "ksize.h" | |
21 | ||
1da177e4 LT |
22 | extern unsigned long switch_to_osf_pal(unsigned long nr, |
23 | struct pcb_struct * pcb_va, struct pcb_struct * pcb_pa, | |
24 | unsigned long *vptb); | |
25 | struct hwrpb_struct *hwrpb = INIT_HWRPB; | |
26 | static struct pcb_struct pcb_va[1]; | |
27 | ||
28 | /* | |
29 | * Find a physical address of a virtual object.. | |
30 | * | |
31 | * This is easy using the virtual page table address. | |
32 | */ | |
33 | ||
34 | static inline void * | |
35 | find_pa(unsigned long *vptb, void *ptr) | |
36 | { | |
37 | unsigned long address = (unsigned long) ptr; | |
38 | unsigned long result; | |
39 | ||
40 | result = vptb[address >> 13]; | |
41 | result >>= 32; | |
42 | result <<= 13; | |
43 | result |= address & 0x1fff; | |
44 | return (void *) result; | |
45 | } | |
46 | ||
47 | /* | |
48 | * This function moves into OSF/1 pal-code, and has a temporary | |
49 | * PCB for that. The kernel proper should replace this PCB with | |
50 | * the real one as soon as possible. | |
51 | * | |
52 | * The page table muckery in here depends on the fact that the boot | |
53 | * code has the L1 page table identity-map itself in the second PTE | |
54 | * in the L1 page table. Thus the L1-page is virtually addressable | |
55 | * itself (through three levels) at virtual address 0x200802000. | |
56 | */ | |
57 | ||
58 | #define VPTB ((unsigned long *) 0x200000000) | |
59 | #define L1 ((unsigned long *) 0x200802000) | |
60 | ||
61 | void | |
62 | pal_init(void) | |
63 | { | |
64 | unsigned long i, rev; | |
65 | struct percpu_struct * percpu; | |
66 | struct pcb_struct * pcb_pa; | |
67 | ||
68 | /* Create the dummy PCB. */ | |
69 | pcb_va->ksp = 0; | |
70 | pcb_va->usp = 0; | |
71 | pcb_va->ptbr = L1[1] >> 32; | |
72 | pcb_va->asn = 0; | |
73 | pcb_va->pcc = 0; | |
74 | pcb_va->unique = 0; | |
75 | pcb_va->flags = 1; | |
76 | pcb_va->res1 = 0; | |
77 | pcb_va->res2 = 0; | |
78 | pcb_pa = find_pa(VPTB, pcb_va); | |
79 | ||
80 | /* | |
81 | * a0 = 2 (OSF) | |
82 | * a1 = return address, but we give the asm the vaddr of the PCB | |
83 | * a2 = physical addr of PCB | |
84 | * a3 = new virtual page table pointer | |
85 | * a4 = KSP (but the asm sets it) | |
86 | */ | |
87 | srm_printk("Switching to OSF PAL-code .. "); | |
88 | ||
89 | i = switch_to_osf_pal(2, pcb_va, pcb_pa, VPTB); | |
90 | if (i) { | |
91 | srm_printk("failed, code %ld\n", i); | |
92 | __halt(); | |
93 | } | |
94 | ||
95 | percpu = (struct percpu_struct *) | |
96 | (INIT_HWRPB->processor_offset + (unsigned long) INIT_HWRPB); | |
97 | rev = percpu->pal_revision = percpu->palcode_avail[2]; | |
98 | ||
99 | srm_printk("Ok (rev %lx)\n", rev); | |
100 | ||
101 | tbia(); /* do it directly in case we are SMP */ | |
102 | } | |
103 | ||
104 | static inline long openboot(void) | |
105 | { | |
106 | char bootdev[256]; | |
107 | long result; | |
108 | ||
109 | result = callback_getenv(ENV_BOOTED_DEV, bootdev, 255); | |
110 | if (result < 0) | |
111 | return result; | |
112 | return callback_open(bootdev, result & 255); | |
113 | } | |
114 | ||
115 | static inline long close(long dev) | |
116 | { | |
117 | return callback_close(dev); | |
118 | } | |
119 | ||
120 | static inline long load(long dev, unsigned long addr, unsigned long count) | |
121 | { | |
122 | char bootfile[256]; | |
123 | extern char _end; | |
124 | long result, boot_size = &_end - (char *) BOOT_ADDR; | |
125 | ||
126 | result = callback_getenv(ENV_BOOTED_FILE, bootfile, 255); | |
127 | if (result < 0) | |
128 | return result; | |
129 | result &= 255; | |
130 | bootfile[result] = '\0'; | |
131 | if (result) | |
132 | srm_printk("Boot file specification (%s) not implemented\n", | |
133 | bootfile); | |
9965a5d5 | 134 | return callback_read(dev, count, (void *)addr, boot_size/512 + 1); |
1da177e4 LT |
135 | } |
136 | ||
137 | /* | |
138 | * Start the kernel. | |
139 | */ | |
140 | static void runkernel(void) | |
141 | { | |
142 | __asm__ __volatile__( | |
143 | "bis %1,%1,$30\n\t" | |
144 | "bis %0,%0,$26\n\t" | |
145 | "ret ($26)" | |
146 | : /* no outputs: it doesn't even return */ | |
147 | : "r" (START_ADDR), | |
148 | "r" (PAGE_SIZE + INIT_STACK)); | |
149 | } | |
150 | ||
151 | void start_kernel(void) | |
152 | { | |
153 | long i; | |
154 | long dev; | |
155 | int nbytes; | |
156 | char envval[256]; | |
157 | ||
158 | srm_printk("Linux/AXP bootloader for Linux " UTS_RELEASE "\n"); | |
159 | if (INIT_HWRPB->pagesize != 8192) { | |
160 | srm_printk("Expected 8kB pages, got %ldkB\n", INIT_HWRPB->pagesize >> 10); | |
161 | return; | |
162 | } | |
163 | pal_init(); | |
164 | dev = openboot(); | |
165 | if (dev < 0) { | |
166 | srm_printk("Unable to open boot device: %016lx\n", dev); | |
167 | return; | |
168 | } | |
169 | dev &= 0xffffffff; | |
170 | srm_printk("Loading vmlinux ..."); | |
171 | i = load(dev, START_ADDR, KERNEL_SIZE); | |
172 | close(dev); | |
173 | if (i != KERNEL_SIZE) { | |
174 | srm_printk("Failed (%lx)\n", i); | |
175 | return; | |
176 | } | |
177 | ||
178 | nbytes = callback_getenv(ENV_BOOTED_OSFLAGS, envval, sizeof(envval)); | |
179 | if (nbytes < 0) { | |
180 | nbytes = 0; | |
181 | } | |
182 | envval[nbytes] = '\0'; | |
183 | strcpy((char*)ZERO_PGE, envval); | |
184 | ||
185 | srm_printk(" Ok\nNow booting the kernel\n"); | |
186 | runkernel(); | |
187 | for (i = 0 ; i < 0x100000000 ; i++) | |
188 | /* nothing */; | |
189 | __halt(); | |
190 | } |