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12#undef DEBUG
13
14#include <linux/crash_dump.h>
15#include <linux/io.h>
16#include <linux/memblock.h>
17#include <asm/code-patching.h>
18#include <asm/kdump.h>
19#include <asm/prom.h>
20#include <asm/firmware.h>
21#include <linux/uaccess.h>
22#include <asm/rtas.h>
23
24#ifdef DEBUG
25#include <asm/udbg.h>
26#define DBG(fmt...) udbg_printf(fmt)
27#else
28#define DBG(fmt...)
29#endif
30
31#ifndef CONFIG_NONSTATIC_KERNEL
32void __init reserve_kdump_trampoline(void)
33{
34 memblock_reserve(0, KDUMP_RESERVE_LIMIT);
35}
36
37static void __init create_trampoline(unsigned long addr)
38{
39 unsigned int *p = (unsigned int *)addr;
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49 patch_instruction(p, PPC_INST_NOP);
50 patch_branch(++p, addr + PHYSICAL_START, 0);
51}
52
53void __init setup_kdump_trampoline(void)
54{
55 unsigned long i;
56
57 DBG(" -> setup_kdump_trampoline()\n");
58
59 for (i = KDUMP_TRAMPOLINE_START; i < KDUMP_TRAMPOLINE_END; i += 8) {
60 create_trampoline(i);
61 }
62
63#ifdef CONFIG_PPC_PSERIES
64 create_trampoline(__pa(system_reset_fwnmi) - PHYSICAL_START);
65 create_trampoline(__pa(machine_check_fwnmi) - PHYSICAL_START);
66#endif
67
68 DBG(" <- setup_kdump_trampoline()\n");
69}
70#endif
71
72static size_t copy_oldmem_vaddr(void *vaddr, char *buf, size_t csize,
73 unsigned long offset, int userbuf)
74{
75 if (userbuf) {
76 if (copy_to_user((char __user *)buf, (vaddr + offset), csize))
77 return -EFAULT;
78 } else
79 memcpy(buf, (vaddr + offset), csize);
80
81 return csize;
82}
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96
97ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
98 size_t csize, unsigned long offset, int userbuf)
99{
100 void *vaddr;
101 phys_addr_t paddr;
102
103 if (!csize)
104 return 0;
105
106 csize = min_t(size_t, csize, PAGE_SIZE);
107 paddr = pfn << PAGE_SHIFT;
108
109 if (memblock_is_region_memory(paddr, csize)) {
110 vaddr = __va(paddr);
111 csize = copy_oldmem_vaddr(vaddr, buf, csize, offset, userbuf);
112 } else {
113 vaddr = __ioremap(paddr, PAGE_SIZE, 0);
114 csize = copy_oldmem_vaddr(vaddr, buf, csize, offset, userbuf);
115 iounmap(vaddr);
116 }
117
118 return csize;
119}
120
121#ifdef CONFIG_PPC_RTAS
122
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125
126void crash_free_reserved_phys_range(unsigned long begin, unsigned long end)
127{
128 unsigned long addr;
129 const __be32 *basep, *sizep;
130 unsigned int rtas_start = 0, rtas_end = 0;
131
132 basep = of_get_property(rtas.dev, "linux,rtas-base", NULL);
133 sizep = of_get_property(rtas.dev, "rtas-size", NULL);
134
135 if (basep && sizep) {
136 rtas_start = be32_to_cpup(basep);
137 rtas_end = rtas_start + be32_to_cpup(sizep);
138 }
139
140 for (addr = begin; addr < end; addr += PAGE_SIZE) {
141
142 if (addr <= rtas_end && ((addr + PAGE_SIZE) > rtas_start))
143 continue;
144
145 free_reserved_page(pfn_to_page(addr >> PAGE_SHIFT));
146 }
147}
148#endif
149