2 * linux/arch/arm/boot/compressed/ofw-shark.c
6 * This file is used to get some basic information
7 * about the memory layout of the shark we are running
8 * on. Memory is usually divided in blocks a 8 MB.
9 * And bootargs are copied from OpenFirmware.
13 #include <linux/kernel.h>
14 #include <linux/types.h>
15 #include <asm/setup.h>
20 create_params (unsigned long *buffer)
22 /* Is there a better address? Also change in mach-shark/core.c */
23 struct tag *tag = (struct tag *) 0x08003000;
24 int j,i,m,k,nr_banks,size;
27 /* Head of the taglist */
28 tag->hdr.tag = ATAG_CORE;
29 tag->hdr.size = tag_size(tag_core);
30 tag->u.core.flags = 1;
31 tag->u.core.pagesize = PAGE_SIZE;
32 tag->u.core.rootdev = 0;
34 /* Build up one tagged block for each memory region */
36 nr_banks=(unsigned int) buffer[0];
37 for (j=0;j<nr_banks;j++){
38 /* search the lowest address and put it into the next entry */
39 /* not a fast sort algorithm, but there are at most 8 entries */
40 /* and this is used only once anyway */
42 for (i=0;i<(unsigned int) buffer[0];i++){
43 if (buffer[2*i+1]<m) {
50 tag->hdr.tag = ATAG_MEM;
51 tag->hdr.size = tag_size(tag_mem32);
52 tag->u.mem.size = buffer[2*k+2];
53 tag->u.mem.start = buffer[2*k+1];
55 size += buffer[2*k+2];
57 buffer[2*k+1]=0xffffffff; /* mark as copied */
60 /* The command line */
62 tag->hdr.tag = ATAG_CMDLINE;
64 c=(unsigned char *)(&buffer[34]);
66 while (*c) tag->u.cmdline.cmdline[j++]=*c++;
68 tag->u.cmdline.cmdline[j]=0;
69 tag->hdr.size = (j + 7 + sizeof(struct tag_header)) >> 2;
71 /* Hardware revision */
73 tag->hdr.tag = ATAG_REVISION;
74 tag->hdr.size = tag_size(tag_revision);
75 tag->u.revision.rev = ((unsigned char) buffer[33])-'0';
77 /* End of the taglist */
84 typedef int (*ofw_handle_t)(void *);
86 /* Everything below is called with a wrong MMU setting.
87 * This means: no string constants, no initialization of
88 * arrays, no global variables! This is ugly but I didn't
89 * want to write this in assembler :-)
93 of_decode_int(const unsigned char *p)
95 unsigned int i = *p++ << 8;
102 OF_finddevice(ofw_handle_t openfirmware, char *name)
104 unsigned int args[8];
119 args[0]=(unsigned int)service;
122 args[3]=(unsigned int)name;
124 if (openfirmware(args) == -1)
130 OF_getproplen(ofw_handle_t openfirmware, int handle, char *prop)
132 unsigned int args[8];
147 args[0] = (unsigned int)service;
150 args[3] = (unsigned int)handle;
151 args[4] = (unsigned int)prop;
153 if (openfirmware(args) == -1)
159 OF_getprop(ofw_handle_t openfirmware, int handle, char *prop, void *buf, unsigned int buflen)
161 unsigned int args[8];
173 args[0] = (unsigned int)service;
176 args[3] = (unsigned int)handle;
177 args[4] = (unsigned int)prop;
178 args[5] = (unsigned int)buf;
181 if (openfirmware(args) == -1)
186 asmlinkage void ofw_init(ofw_handle_t o, int *nomr, int *pointer)
188 int phandle,i,mem_len,buffer[32];
200 phandle=OF_finddevice(o,temp);
207 mem_len = OF_getproplen(o,phandle, temp);
208 OF_getprop(o,phandle, temp, buffer, mem_len);
211 for (i=0; i<=mem_len/4; i++) pointer[i]=of_decode_int((const unsigned char *)&buffer[i]);
222 phandle=OF_finddevice(o,temp);
234 mem_len = OF_getproplen(o,phandle, temp);
235 OF_getprop(o,phandle, temp, buffer, mem_len);
236 if (mem_len > 128) mem_len=128;
237 for (i=0; i<=mem_len/4; i++) pointer[i+33]=buffer[i];
242 phandle=OF_finddevice(o,temp);
255 mem_len = OF_getproplen(o,phandle, temp);
256 OF_getprop(o,phandle, temp, buffer, mem_len);
257 (unsigned char) pointer[32] = ((unsigned char *) buffer)[mem_len-2];