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1da177e4 LT |
1 | /* |
2 | * arch/ia64/hp/sim/boot/bootloader.c | |
3 | * | |
4 | * Loads an ELF kernel. | |
5 | * | |
6 | * Copyright (C) 1998-2003 Hewlett-Packard Co | |
7 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
8 | * Stephane Eranian <eranian@hpl.hp.com> | |
9 | * | |
10 | * 01/07/99 S.Eranian modified to pass command line arguments to kernel | |
11 | */ | |
12 | struct task_struct; /* forward declaration for elf.h */ | |
13 | ||
14 | #include <linux/config.h> | |
15 | #include <linux/elf.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/kernel.h> | |
18 | ||
19 | #include <asm/elf.h> | |
20 | #include <asm/intrinsics.h> | |
21 | #include <asm/pal.h> | |
22 | #include <asm/pgtable.h> | |
23 | #include <asm/sal.h> | |
24 | #include <asm/system.h> | |
25 | ||
26 | #include "ssc.h" | |
27 | ||
28 | struct disk_req { | |
29 | unsigned long addr; | |
30 | unsigned len; | |
31 | }; | |
32 | ||
4aec0fb1 IW |
33 | /* SSC_WAIT_COMPLETION appears to want this large alignment. gcc < 4 |
34 | * seems to give it by default, however gcc > 4 is smarter and may | |
35 | * not. | |
36 | */ | |
1da177e4 LT |
37 | struct disk_stat { |
38 | int fd; | |
39 | unsigned count; | |
4aec0fb1 | 40 | } __attribute__ ((aligned (16))); |
1da177e4 LT |
41 | |
42 | extern void jmp_to_kernel (unsigned long bp, unsigned long e_entry); | |
43 | extern struct ia64_boot_param *sys_fw_init (const char *args, int arglen); | |
44 | extern void debug_break (void); | |
45 | ||
46 | static void | |
47 | cons_write (const char *buf) | |
48 | { | |
49 | unsigned long ch; | |
50 | ||
51 | while ((ch = *buf++) != '\0') { | |
52 | ssc(ch, 0, 0, 0, SSC_PUTCHAR); | |
53 | if (ch == '\n') | |
54 | ssc('\r', 0, 0, 0, SSC_PUTCHAR); | |
55 | } | |
56 | } | |
57 | ||
58 | #define MAX_ARGS 32 | |
59 | ||
60 | void | |
61 | start_bootloader (void) | |
62 | { | |
63 | static char mem[4096]; | |
64 | static char buffer[1024]; | |
65 | unsigned long off; | |
66 | int fd, i; | |
67 | struct disk_req req; | |
68 | struct disk_stat stat; | |
69 | struct elfhdr *elf; | |
70 | struct elf_phdr *elf_phdr; /* program header */ | |
71 | unsigned long e_entry, e_phoff, e_phnum; | |
72 | register struct ia64_boot_param *bp; | |
73 | char *kpath, *args; | |
74 | long arglen = 0; | |
75 | ||
76 | ssc(0, 0, 0, 0, SSC_CONSOLE_INIT); | |
77 | ||
78 | /* | |
79 | * S.Eranian: extract the commandline argument from the simulator | |
80 | * | |
81 | * The expected format is as follows: | |
82 | * | |
83 | * kernelname args... | |
84 | * | |
85 | * Both are optional but you can't have the second one without the first. | |
86 | */ | |
87 | arglen = ssc((long) buffer, 0, 0, 0, SSC_GET_ARGS); | |
88 | ||
89 | kpath = "vmlinux"; | |
90 | args = buffer; | |
91 | if (arglen > 0) { | |
92 | kpath = buffer; | |
93 | while (*args != ' ' && *args != '\0') | |
94 | ++args, --arglen; | |
95 | if (*args == ' ') | |
96 | *args++ = '\0', --arglen; | |
97 | } | |
98 | ||
99 | if (arglen <= 0) { | |
100 | args = ""; | |
101 | arglen = 1; | |
102 | } | |
103 | ||
104 | fd = ssc((long) kpath, 1, 0, 0, SSC_OPEN); | |
105 | ||
106 | if (fd < 0) { | |
107 | cons_write(kpath); | |
108 | cons_write(": file not found, reboot now\n"); | |
109 | for(;;); | |
110 | } | |
111 | stat.fd = fd; | |
112 | off = 0; | |
113 | ||
114 | req.len = sizeof(mem); | |
115 | req.addr = (long) mem; | |
116 | ssc(fd, 1, (long) &req, off, SSC_READ); | |
117 | ssc((long) &stat, 0, 0, 0, SSC_WAIT_COMPLETION); | |
118 | ||
119 | elf = (struct elfhdr *) mem; | |
120 | if (elf->e_ident[0] == 0x7f && strncmp(elf->e_ident + 1, "ELF", 3) != 0) { | |
121 | cons_write("not an ELF file\n"); | |
122 | return; | |
123 | } | |
124 | if (elf->e_type != ET_EXEC) { | |
125 | cons_write("not an ELF executable\n"); | |
126 | return; | |
127 | } | |
128 | if (!elf_check_arch(elf)) { | |
129 | cons_write("kernel not for this processor\n"); | |
130 | return; | |
131 | } | |
132 | ||
133 | e_entry = elf->e_entry; | |
134 | e_phnum = elf->e_phnum; | |
135 | e_phoff = elf->e_phoff; | |
136 | ||
137 | cons_write("loading "); | |
138 | cons_write(kpath); | |
139 | cons_write("...\n"); | |
140 | ||
141 | for (i = 0; i < e_phnum; ++i) { | |
142 | req.len = sizeof(*elf_phdr); | |
143 | req.addr = (long) mem; | |
144 | ssc(fd, 1, (long) &req, e_phoff, SSC_READ); | |
145 | ssc((long) &stat, 0, 0, 0, SSC_WAIT_COMPLETION); | |
146 | if (stat.count != sizeof(*elf_phdr)) { | |
147 | cons_write("failed to read phdr\n"); | |
148 | return; | |
149 | } | |
150 | e_phoff += sizeof(*elf_phdr); | |
151 | ||
152 | elf_phdr = (struct elf_phdr *) mem; | |
153 | ||
154 | if (elf_phdr->p_type != PT_LOAD) | |
155 | continue; | |
156 | ||
157 | req.len = elf_phdr->p_filesz; | |
158 | req.addr = __pa(elf_phdr->p_paddr); | |
159 | ssc(fd, 1, (long) &req, elf_phdr->p_offset, SSC_READ); | |
160 | ssc((long) &stat, 0, 0, 0, SSC_WAIT_COMPLETION); | |
161 | memset((char *)__pa(elf_phdr->p_paddr) + elf_phdr->p_filesz, 0, | |
162 | elf_phdr->p_memsz - elf_phdr->p_filesz); | |
163 | } | |
164 | ssc(fd, 0, 0, 0, SSC_CLOSE); | |
165 | ||
166 | cons_write("starting kernel...\n"); | |
167 | ||
168 | /* fake an I/O base address: */ | |
169 | ia64_setreg(_IA64_REG_AR_KR0, 0xffffc000000UL); | |
170 | ||
171 | bp = sys_fw_init(args, arglen); | |
172 | ||
173 | ssc(0, (long) kpath, 0, 0, SSC_LOAD_SYMBOLS); | |
174 | ||
175 | debug_break(); | |
176 | jmp_to_kernel((unsigned long) bp, e_entry); | |
177 | ||
178 | cons_write("kernel returned!\n"); | |
179 | ssc(-1, 0, 0, 0, SSC_EXIT); | |
180 | } |