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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
#include <string.h>
#include <stddef.h>
#include "hwrpb.h"
#include "osf.h"
#include "uart.h"
#define PAGE_SHIFT 13
#define PAGE_SIZE (1ul << PAGE_SHIFT)
#define PAGE_OFFSET 0xfffffc0000000000UL
#define VPTPTR 0xfffffffe00000000UL
#define PA(VA) ((unsigned long)(VA) & 0xfffffffffful)
#define VA(PA) ((void *)(PA) + PAGE_OFFSET)
#define HZ 1024
struct hwrpb_combine {
struct hwrpb_struct hwrpb;
struct percpu_struct processor;
struct memdesc_struct md;
struct memclust_struct mc[2];
};
extern char stack[PAGE_SIZE] __attribute__((section(".sbss")));
extern char _end[] __attribute__((visibility("hidden"), nocommon));
struct pcb_struct pcb __attribute__((section(".sbss")));
static unsigned long page_dir[1024] __attribute__((aligned(PAGE_SIZE)));
/* The HWRPB must be aligned because it is exported at INIT_HWRPB. */
struct hwrpb_combine hwrpb __attribute__((aligned(PAGE_SIZE)));
static void *last_alloc;
static void *
alloc (unsigned long size, unsigned long align)
{
void *p = (void *)(((unsigned long)last_alloc + align - 1) & ~(align - 1));
last_alloc = p + size;
return memset (p, 0, size);
}
static inline unsigned long
pt_index(unsigned long addr, int level)
{
return (addr >> (PAGE_SHIFT + (10 * level))) & 0x3ff;
}
static inline unsigned long
build_pte (void *page)
{
unsigned long bits;
bits = PA((unsigned long)page) << (32 - PAGE_SHIFT);
bits += _PAGE_VALID | _PAGE_KRE | _PAGE_KWE;
return bits;
}
static inline void *
pte_page (unsigned long pte)
{
return VA(pte >> 32 << PAGE_SHIFT);
}
static void
set_pte (unsigned long addr, void *page)
{
unsigned long *pt = page_dir;
unsigned long index;
index = pt_index(addr, 2);
if (pt[index] != 0)
pt = pte_page (pt[index]);
else
{
unsigned long *npt = alloc(PAGE_SIZE, PAGE_SIZE);
pt[index] = build_pte (npt);
pt = npt;
}
index = pt_index(addr, 1);
if (pt[index] != 0)
pt = pte_page (pt[index]);
else
{
unsigned long *npt = alloc(PAGE_SIZE, PAGE_SIZE);
pt[index] = build_pte (npt);
pt = npt;
}
index = pt_index(addr, 0);
pt[index] = build_pte (page);
}
static void
init_page_table(void)
{
/* Install the self-reference for the virtual page table base register. */
page_dir[pt_index(VPTPTR, 2)] = build_pte(page_dir);
set_pte ((unsigned long)INIT_HWRPB, &hwrpb);
/* ??? SRM maps some amount of memory at 0x20000000 for use by programs
started from the console prompt. Including the bootloader. While
we're emulating MILO, don't bother as we jump straight to the kernel
loaded into KSEG. */
}
static inline unsigned long
init_cpuid (void)
{
unsigned long implver, amask;
implver = __builtin_alpha_implver();
amask = ~__builtin_alpha_amask(-1);
switch (implver)
{
case 0: /* EV4 */
return EV4_CPU;
case 1: /* EV5 */
if ((amask & 0x101) == 0x101) /* MAX + BWX */
return PCA56_CPU;
if (amask & 1) /* BWX */
return EV56_CPU;
return EV5_CPU;
case 2: /* EV6 */
if (amask & 4) /* CIX */
return EV67_CPU;
return EV6_CPU;
}
return 0;
}
static void
init_hwrpb (unsigned long memsize)
{
unsigned long pal_pages;
hwrpb.hwrpb.phys_addr = PA(&hwrpb);
/* Yes, the 'HWRPB' magic is in big-endian byte ordering. */
hwrpb.hwrpb.id = ( (long)'H' << 56
| (long)'W' << 48
| (long)'R' << 40
| (long)'P' << 32
| (long)'B' << 24);
hwrpb.hwrpb.size = sizeof(struct hwrpb_struct);
/* The inclusion of MILO here tells the Linux kernel that we do
not (yet) support any of the extended console support routines
that are in SRM. */
((int *)hwrpb.hwrpb.ssn)[0] = ( 'M' << 0
| 'I' << 8
| 'L' << 16
| 'O' << 24);
((int *)hwrpb.hwrpb.ssn)[1] = ( ' ' << 0
| 'Q' << 8
| 'E' << 16
| 'M' << 24);
((int *)hwrpb.hwrpb.ssn)[2] = ( 'U' << 0);
/* For now, hard-code emulation of sx164. */
hwrpb.hwrpb.cpuid = PCA56_CPU;
hwrpb.hwrpb.pagesize = PAGE_SIZE;
hwrpb.hwrpb.pa_bits = 40;
hwrpb.hwrpb.max_asn = 127;
hwrpb.hwrpb.sys_type = ST_DEC_EB164;
hwrpb.hwrpb.sys_variation = 15 << 10;
hwrpb.hwrpb.sys_revision = 0;
hwrpb.processor.type = PCA56_CPU;
hwrpb.hwrpb.intr_freq = HZ * 4096;
/* ??? What the hell should we put here. Measure like the kernel will? */
hwrpb.hwrpb.cycle_freq = 400000000;
hwrpb.hwrpb.vptb = VPTPTR;
hwrpb.hwrpb.nr_processors = 1;
hwrpb.hwrpb.processor_size = sizeof(struct percpu_struct);
hwrpb.hwrpb.processor_offset = offsetof(struct hwrpb_combine, processor);
hwrpb.hwrpb.mddt_offset = offsetof(struct hwrpb_combine, md);
hwrpb.md.numclusters = 2;
pal_pages = (PA(last_alloc) + PAGE_SIZE - 1) >> PAGE_SHIFT;
hwrpb.mc[0].numpages = pal_pages;
hwrpb.mc[0].usage = 1;
hwrpb.mc[1].start_pfn = pal_pages;
hwrpb.mc[1].numpages = (memsize >> PAGE_SHIFT) - pal_pages;
{
unsigned long sum = 0, *l;
for (l = (unsigned long *) &hwrpb.hwrpb; l < &hwrpb.hwrpb.chksum; ++l)
sum += *l;
hwrpb.hwrpb.chksum = sum;
}
}
static void
init_pcb (void)
{
pcb.ksp = (unsigned long)stack + sizeof(stack);
pcb.ptbr = PA(page_dir) >> PAGE_SHIFT;
pcb.flags = 1; /* FEN */
}
void
do_hello(void)
{
uart_puts(COM1, "Hello, World!\n");
asm ("halt");
__builtin_unreachable ();
}
void
do_start(unsigned long memsize, void (*kernel_entry)(void))
{
last_alloc = _end;
init_page_table();
init_hwrpb(memsize);
init_pcb();
uart_init();
{
register int variant __asm__("$16") = 2; /* OSF/1 PALcode */
register void (*pc)(void) __asm__("$17");
register unsigned long pa_pcb __asm__("$18");
register unsigned long vptptr __asm__("$19");
pc = (kernel_entry ? kernel_entry : do_hello);
pa_pcb = PA(&pcb);
vptptr = VPTPTR;
asm("call_pal 0x0a" : : "r"(variant), "r"(pc), "r"(pa_pcb), "r"(vptptr));
}
__builtin_unreachable ();
}
|
