File: /usr/src/linux/arch/parisc/mm/pa20.c
1 /* $Id: pa20.c,v 1.1 1999/03/17 01:05:41 pjlahaie Exp $
2 *
3 * pa20.c: PA 2.0 specific mmu/cache code.
4 *
5 */
6 #include <linux/init.h>
7 #include <linux/kernel.h>
8 #include <linux/sched.h>
9 #include <linux/mm.h>
10
11 #include <asm/page.h>
12 #include <asm/pgtable.h>
13 #include <asm/system.h>
14 #include <asm/sgialib.h>
15 #include <asm/mmu_context.h>
16
17 extern unsigned long mips_tlb_entries;
18
19 /* page functions */
20 void pa20_clear_page(unsigned long page)
21 {
22 }
23
24 static void pa20_copy_page(unsigned long to, unsigned long from)
25 {
26 }
27
28 /* Cache operations. */
29 static inline void pa20_flush_cache_all(void) { }
30 static void pa20_flush_cache_mm(struct mm_struct *mm) { }
31 static void pa20_flush_cache_range(struct mm_struct *mm,
32 unsigned long start,
33 unsigned long end)
34 {
35 }
36
37 static void pa20_flush_cache_page(struct vm_area_struct *vma,
38 unsigned long page)
39 {
40 }
41
42 static void pa20_flush_page_to_ram(unsigned long page)
43 {
44 }
45
46 static void pa20_flush_cache_sigtramp(unsigned long page)
47 {
48 }
49
50 /* TLB operations. */
51 static inline void pa20_flush_tlb_all(void)
52 {
53 unsigned long flags;
54 int entry;
55
56 save_and_cli(flags);
57 /* Here we will need to flush all the TLBs */
58 restore_flags(flags);
59 }
60
61 static void pa20_flush_tlb_mm(struct mm_struct *mm)
62 {
63 /* This is what the MIPS does.. Is it the right thing for PA-RISC? */
64 if(mm == current->mm)
65 pa20_flush_tlb_all();
66 }
67
68 static void pa20_flush_tlb_range(struct mm_struct *mm, unsigned long start,
69 unsigned long end)
70 {
71 if(mm == current->mm)
72 pa20_flush_tlb_all();
73 }
74
75 static void pa20_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
76 {
77 if(vma->vm_mm == current->mm)
78 pa20_flush_tlb_all();
79 }
80
81 static void pa20_load_pgd(unsigned long pg_dir)
82 {
83 unsigned long flags;
84 /* We need to do the right thing here */
85 }
86
87 /*
88 * Initialize new page directory with pointers to invalid ptes
89 */
90 static void pa20_pgd_init(unsigned long page)
91 {
92 unsigned long dummy1, dummy2;
93
94 }
95
96 static void pa20_update_mmu_cache(struct vm_area_struct * vma,
97 unsigned long address, pte_t pte)
98 {
99 pa20_flush_tlb_page(vma, address);
100 }
101
102 static void pa20_show_regs(struct pt_regs * regs)
103 {
104 /*
105 * Saved main processor registers
106 */
107 printk("$0 : %08x %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
108 0, (unsigned long) regs->regs[1], (unsigned long) regs->regs[2],
109 (unsigned long) regs->regs[3], (unsigned long) regs->regs[4],
110 (unsigned long) regs->regs[5], (unsigned long) regs->regs[6],
111 (unsigned long) regs->regs[7]);
112 printk("$8 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
113 (unsigned long) regs->regs[8], (unsigned long) regs->regs[9],
114 (unsigned long) regs->regs[10], (unsigned long) regs->regs[11],
115 (unsigned long) regs->regs[12], (unsigned long) regs->regs[13],
116 (unsigned long) regs->regs[14], (unsigned long) regs->regs[15]);
117 printk("$16: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
118 (unsigned long) regs->regs[16], (unsigned long) regs->regs[17],
119 (unsigned long) regs->regs[18], (unsigned long) regs->regs[19],
120 (unsigned long) regs->regs[20], (unsigned long) regs->regs[21],
121 (unsigned long) regs->regs[22], (unsigned long) regs->regs[23]);
122 printk("$24: %08lx %08lx %08lx %08lx %08lx %08lx\n",
123 (unsigned long) regs->regs[24], (unsigned long) regs->regs[25],
124 (unsigned long) regs->regs[28], (unsigned long) regs->regs[29],
125 (unsigned long) regs->regs[30], (unsigned long) regs->regs[31]);
126
127 /*
128 * Saved cp0 registers
129 */
130 printk("epc : %08lx\nStatus: %08x\nCause : %08x\n",
131 (unsigned long) regs->cp0_epc, (unsigned int) regs->cp0_status,
132 (unsigned int) regs->cp0_cause);
133 }
134
135 static int pa20_user_mode(struct pt_regs *regs)
136 {
137 /* Return user mode stuff?? */
138 }
139
140 __initfunc(void ld_mmu_pa20(void))
141 {
142
143 /* Taken directly from the MIPS arch.. Lots of bad things here */
144 clear_page = pa20_clear_page;
145 copy_page = pa20_copy_page;
146
147 flush_cache_all = pa20_flush_cache_all;
148 flush_cache_mm = pa20_flush_cache_mm;
149 flush_cache_range = pa20_flush_cache_range;
150 flush_cache_page = pa20_flush_cache_page;
151 flush_cache_sigtramp = pa20_flush_cache_sigtramp;
152 flush_page_to_ram = pa20_flush_page_to_ram;
153
154 flush_tlb_all = pa20_flush_tlb_all;
155 flush_tlb_mm = pa20_flush_tlb_mm;
156 flush_tlb_range = pa20_flush_tlb_range;
157 flush_tlb_page = pa20_flush_tlb_page;
158 pa20_asid_setup();
159
160 load_pgd = pa20_load_pgd;
161 pgd_init = pa20_pgd_init;
162 update_mmu_cache = pa20_update_mmu_cache;
163
164 show_regs = pa20_show_regs;
165
166 add_wired_entry = pa20_add_wired_entry;
167
168 user_mode = pa20_user_mode;
169 flush_tlb_all();
170 }
171