ia64/linux-2.6.18-xen.hg

view include/asm-i386/floppy.h @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 831230e53067
children
line source
1 /*
2 * Architecture specific parts of the Floppy driver
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1995
9 */
10 #ifndef __ASM_I386_FLOPPY_H
11 #define __ASM_I386_FLOPPY_H
13 #include <linux/vmalloc.h>
16 /*
17 * The DMA channel used by the floppy controller cannot access data at
18 * addresses >= 16MB
19 *
20 * Went back to the 1MB limit, as some people had problems with the floppy
21 * driver otherwise. It doesn't matter much for performance anyway, as most
22 * floppy accesses go through the track buffer.
23 */
24 #define _CROSS_64KB(a,s,vdma) \
25 (!(vdma) && ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64))
27 #define CROSS_64KB(a,s) _CROSS_64KB(a,s,use_virtual_dma & 1)
30 #define SW fd_routine[use_virtual_dma&1]
31 #define CSW fd_routine[can_use_virtual_dma & 1]
34 #define fd_inb(port) inb_p(port)
35 #define fd_outb(value,port) outb_p(value,port)
37 #define fd_request_dma() CSW._request_dma(FLOPPY_DMA,"floppy")
38 #define fd_free_dma() CSW._free_dma(FLOPPY_DMA)
39 #define fd_enable_irq() enable_irq(FLOPPY_IRQ)
40 #define fd_disable_irq() disable_irq(FLOPPY_IRQ)
41 #define fd_free_irq() free_irq(FLOPPY_IRQ, NULL)
42 #define fd_get_dma_residue() SW._get_dma_residue(FLOPPY_DMA)
43 #define fd_dma_mem_alloc(size) SW._dma_mem_alloc(size)
44 #define fd_dma_setup(addr, size, mode, io) SW._dma_setup(addr, size, mode, io)
46 #define FLOPPY_CAN_FALLBACK_ON_NODMA
48 static int virtual_dma_count;
49 static int virtual_dma_residue;
50 static char *virtual_dma_addr;
51 static int virtual_dma_mode;
52 static int doing_pdma;
54 static irqreturn_t floppy_hardint(int irq, void *dev_id, struct pt_regs * regs)
55 {
56 register unsigned char st;
58 #undef TRACE_FLPY_INT
60 #ifdef TRACE_FLPY_INT
61 static int calls=0;
62 static int bytes=0;
63 static int dma_wait=0;
64 #endif
65 if (!doing_pdma)
66 return floppy_interrupt(irq, dev_id, regs);
68 #ifdef TRACE_FLPY_INT
69 if(!calls)
70 bytes = virtual_dma_count;
71 #endif
73 {
74 register int lcount;
75 register char *lptr;
77 st = 1;
78 for(lcount=virtual_dma_count, lptr=virtual_dma_addr;
79 lcount; lcount--, lptr++) {
80 st=inb(virtual_dma_port+4) & 0xa0 ;
81 if(st != 0xa0)
82 break;
83 if(virtual_dma_mode)
84 outb_p(*lptr, virtual_dma_port+5);
85 else
86 *lptr = inb_p(virtual_dma_port+5);
87 }
88 virtual_dma_count = lcount;
89 virtual_dma_addr = lptr;
90 st = inb(virtual_dma_port+4);
91 }
93 #ifdef TRACE_FLPY_INT
94 calls++;
95 #endif
96 if(st == 0x20)
97 return IRQ_HANDLED;
98 if(!(st & 0x20)) {
99 virtual_dma_residue += virtual_dma_count;
100 virtual_dma_count=0;
101 #ifdef TRACE_FLPY_INT
102 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n",
103 virtual_dma_count, virtual_dma_residue, calls, bytes,
104 dma_wait);
105 calls = 0;
106 dma_wait=0;
107 #endif
108 doing_pdma = 0;
109 floppy_interrupt(irq, dev_id, regs);
110 return IRQ_HANDLED;
111 }
112 #ifdef TRACE_FLPY_INT
113 if(!virtual_dma_count)
114 dma_wait++;
115 #endif
116 return IRQ_HANDLED;
117 }
119 static void fd_disable_dma(void)
120 {
121 if(! (can_use_virtual_dma & 1))
122 disable_dma(FLOPPY_DMA);
123 doing_pdma = 0;
124 virtual_dma_residue += virtual_dma_count;
125 virtual_dma_count=0;
126 }
128 static int vdma_request_dma(unsigned int dmanr, const char * device_id)
129 {
130 return 0;
131 }
133 static void vdma_nop(unsigned int dummy)
134 {
135 }
138 static int vdma_get_dma_residue(unsigned int dummy)
139 {
140 return virtual_dma_count + virtual_dma_residue;
141 }
144 static int fd_request_irq(void)
145 {
146 if(can_use_virtual_dma)
147 return request_irq(FLOPPY_IRQ, floppy_hardint,
148 IRQF_DISABLED, "floppy", NULL);
149 else
150 return request_irq(FLOPPY_IRQ, floppy_interrupt,
151 IRQF_DISABLED, "floppy", NULL);
153 }
155 static unsigned long dma_mem_alloc(unsigned long size)
156 {
157 return __get_dma_pages(GFP_KERNEL,get_order(size));
158 }
161 static unsigned long vdma_mem_alloc(unsigned long size)
162 {
163 return (unsigned long) vmalloc(size);
165 }
167 #define nodma_mem_alloc(size) vdma_mem_alloc(size)
169 static void _fd_dma_mem_free(unsigned long addr, unsigned long size)
170 {
171 if((unsigned int) addr >= (unsigned int) high_memory)
172 vfree((void *)addr);
173 else
174 free_pages(addr, get_order(size));
175 }
177 #define fd_dma_mem_free(addr, size) _fd_dma_mem_free(addr, size)
179 static void _fd_chose_dma_mode(char *addr, unsigned long size)
180 {
181 if(can_use_virtual_dma == 2) {
182 if((unsigned int) addr >= (unsigned int) high_memory ||
183 isa_virt_to_bus(addr) >= 0x1000000 ||
184 _CROSS_64KB(addr, size, 0))
185 use_virtual_dma = 1;
186 else
187 use_virtual_dma = 0;
188 } else {
189 use_virtual_dma = can_use_virtual_dma & 1;
190 }
191 }
193 #define fd_chose_dma_mode(addr, size) _fd_chose_dma_mode(addr, size)
196 static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io)
197 {
198 doing_pdma = 1;
199 virtual_dma_port = io;
200 virtual_dma_mode = (mode == DMA_MODE_WRITE);
201 virtual_dma_addr = addr;
202 virtual_dma_count = size;
203 virtual_dma_residue = 0;
204 return 0;
205 }
207 static int hard_dma_setup(char *addr, unsigned long size, int mode, int io)
208 {
209 #ifdef FLOPPY_SANITY_CHECK
210 if (CROSS_64KB(addr, size)) {
211 printk("DMA crossing 64-K boundary %p-%p\n", addr, addr+size);
212 return -1;
213 }
214 #endif
215 /* actual, physical DMA */
216 doing_pdma = 0;
217 clear_dma_ff(FLOPPY_DMA);
218 set_dma_mode(FLOPPY_DMA,mode);
219 set_dma_addr(FLOPPY_DMA,isa_virt_to_bus(addr));
220 set_dma_count(FLOPPY_DMA,size);
221 enable_dma(FLOPPY_DMA);
222 return 0;
223 }
225 static struct fd_routine_l {
226 int (*_request_dma)(unsigned int dmanr, const char * device_id);
227 void (*_free_dma)(unsigned int dmanr);
228 int (*_get_dma_residue)(unsigned int dummy);
229 unsigned long (*_dma_mem_alloc) (unsigned long size);
230 int (*_dma_setup)(char *addr, unsigned long size, int mode, int io);
231 } fd_routine[] = {
232 {
233 request_dma,
234 free_dma,
235 get_dma_residue,
236 dma_mem_alloc,
237 hard_dma_setup
238 },
239 {
240 vdma_request_dma,
241 vdma_nop,
242 vdma_get_dma_residue,
243 vdma_mem_alloc,
244 vdma_dma_setup
245 }
246 };
249 static int FDC1 = 0x3f0;
250 static int FDC2 = -1;
252 /*
253 * Floppy types are stored in the rtc's CMOS RAM and so rtc_lock
254 * is needed to prevent corrupted CMOS RAM in case "insmod floppy"
255 * coincides with another rtc CMOS user. Paul G.
256 */
257 #define FLOPPY0_TYPE ({ \
258 unsigned long flags; \
259 unsigned char val; \
260 spin_lock_irqsave(&rtc_lock, flags); \
261 val = (CMOS_READ(0x10) >> 4) & 15; \
262 spin_unlock_irqrestore(&rtc_lock, flags); \
263 val; \
264 })
266 #define FLOPPY1_TYPE ({ \
267 unsigned long flags; \
268 unsigned char val; \
269 spin_lock_irqsave(&rtc_lock, flags); \
270 val = CMOS_READ(0x10) & 15; \
271 spin_unlock_irqrestore(&rtc_lock, flags); \
272 val; \
273 })
275 #define N_FDC 2
276 #define N_DRIVE 8
278 #define FLOPPY_MOTOR_MASK 0xf0
280 #define AUTO_DMA
282 #define EXTRA_FLOPPY_PARAMS
284 #endif /* __ASM_I386_FLOPPY_H */