1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/*
* arch/alpha/boot/bootp.c
*
* Copyright (C) 1997 Jay Estabrook
*
* This file is used for creating a bootp file for the Linux/AXP kernel
*
* based significantly on the arch/alpha/boot/main.c of Linus Torvalds
*/
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/version.h>
#include <linux/mm.h>
#include <asm/system.h>
#include <asm/console.h>
#include <asm/hwrpb.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <stdarg.h>
#include "ksize.h"
extern unsigned long switch_to_osf_pal(unsigned long nr,
struct pcb_struct * pcb_va, struct pcb_struct * pcb_pa,
unsigned long *vptb);
struct hwrpb_struct *hwrpb = INIT_HWRPB;
static struct pcb_struct pcb_va[1];
/*
* Find a physical address of a virtual object..
*
* This is easy using the virtual page table address.
*/
static inline void *
find_pa(unsigned long *vptb, void *ptr)
{
unsigned long address = (unsigned long) ptr;
unsigned long result;
result = vptb[address >> 13];
result >>= 32;
result <<= 13;
result |= address & 0x1fff;
return (void *) result;
}
/*
* This function moves into OSF/1 pal-code, and has a temporary
* PCB for that. The kernel proper should replace this PCB with
* the real one as soon as possible.
*
* The page table muckery in here depends on the fact that the boot
* code has the L1 page table identity-map itself in the second PTE
* in the L1 page table. Thus the L1-page is virtually addressable
* itself (through three levels) at virtual address 0x200802000.
*/
#define VPTB ((unsigned long *) 0x200000000)
#define L1 ((unsigned long *) 0x200802000)
void
pal_init(void)
{
unsigned long i, rev;
struct percpu_struct * percpu;
struct pcb_struct * pcb_pa;
/* Create the dummy PCB. */
pcb_va->ksp = 0;
pcb_va->usp = 0;
pcb_va->ptbr = L1[1] >> 32;
pcb_va->asn = 0;
pcb_va->pcc = 0;
pcb_va->unique = 0;
pcb_va->flags = 1;
pcb_va->res1 = 0;
pcb_va->res2 = 0;
pcb_pa = find_pa(VPTB, pcb_va);
/*
* a0 = 2 (OSF)
* a1 = return address, but we give the asm the vaddr of the PCB
* a2 = physical addr of PCB
* a3 = new virtual page table pointer
* a4 = KSP (but the asm sets it)
*/
srm_printk("Switching to OSF PAL-code .. ");
i = switch_to_osf_pal(2, pcb_va, pcb_pa, VPTB);
if (i) {
srm_printk("failed, code %ld\n", i);
halt();
}
percpu = (struct percpu_struct *)
(INIT_HWRPB->processor_offset + (unsigned long) INIT_HWRPB);
rev = percpu->pal_revision = percpu->palcode_avail[2];
srm_printk("Ok (rev %lx)\n", rev);
tbia(); /* do it directly in case we are SMP */
}
static inline void
load(unsigned long dst, unsigned long src, unsigned long count)
{
memcpy((void *)dst, (void *)src, count);
}
/*
* Start the kernel.
*/
static inline void
runkernel(void)
{
__asm__ __volatile__(
"bis %1,%1,$30\n\t"
"bis %0,%0,$27\n\t"
"jmp ($27)"
: /* no outputs: it doesn't even return */
: "r" (START_ADDR),
"r" (PAGE_SIZE + INIT_STACK));
}
extern char _end;
#define KERNEL_ORIGIN \
((((unsigned long)&_end) + 511) & ~511)
void
start_kernel(void)
{
/*
* Note that this crufty stuff with static and envval
* and envbuf is because:
*
* 1. Frequently, the stack is short, and we don't want to overrun;
* 2. Frequently the stack is where we are going to copy the kernel to;
* 3. A certain SRM console required the GET_ENV output to stack.
* ??? A comment in the aboot sources indicates that the GET_ENV
* destination must be quadword aligned. Might this explain the
* behaviour, rather than requiring output to the stack, which
* seems rather far-fetched.
*/
static long nbytes;
static char envval[256] __attribute__((aligned(8)));
#ifdef INITRD_SIZE
static unsigned long initrd_start;
#endif
srm_printk("Linux/AXP bootp loader for Linux " UTS_RELEASE "\n");
if (INIT_HWRPB->pagesize != 8192) {
srm_printk("Expected 8kB pages, got %ldkB\n",
INIT_HWRPB->pagesize >> 10);
return;
}
if (INIT_HWRPB->vptb != (unsigned long) VPTB) {
srm_printk("Expected vptb at %p, got %p\n",
VPTB, (void *)INIT_HWRPB->vptb);
return;
}
pal_init();
#ifdef INITRD_SIZE
/* The initrd must be page-aligned. See below for the
cause of the magic number 5. */
initrd_start = ((START_ADDR + 5*KERNEL_SIZE) | (PAGE_SIZE-1)) + 1;
srm_printk("Initrd positioned at %#lx\n", initrd_start);
#endif
nbytes = srm_dispatch(CCB_GET_ENV, ENV_BOOTED_OSFLAGS,
envval, sizeof(envval));
if (nbytes < 0 || nbytes >= sizeof(envval)) {
nbytes = 0;
}
envval[nbytes] = '\0';
srm_printk("Loading the kernel...'%s'\n", envval);
/* NOTE: *no* callbacks or printouts from here on out!!! */
/*
* This is a hack, as some consoles seem to get virtual 20000000
* (ie where the SRM console puts the kernel bootp image) memory
* overlapping physical 310000 memory, which causes real problems
* when attempting to copy the former to the latter... :-(
*
* So, we first move the kernel virtual-to-physical way above where
* we physically want the kernel to end up, then copy it from there
* to its final resting place... ;-}
*
* Sigh...
*/
#ifdef INITRD_SIZE
load(initrd_start, KERNEL_ORIGIN+KERNEL_SIZE, INITRD_SIZE);
#endif
load(START_ADDR+(4*KERNEL_SIZE), KERNEL_ORIGIN, KERNEL_SIZE);
load(START_ADDR, START_ADDR+(4*KERNEL_SIZE), KERNEL_SIZE);
memset((char*)ZERO_PAGE(0), 0, PAGE_SIZE);
strcpy((char*)ZERO_PAGE(0), envval);
#ifdef INITRD_SIZE
((long *)(ZERO_PAGE(0)+256))[0] = initrd_start;
((long *)(ZERO_PAGE(0)+256))[1] = INITRD_SIZE;
#endif
runkernel();
}
|
