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/*
* linux/arch/arm/boot/compressed/ofw-shark.c
*
* by Alexander Schulz <aschulz@netwinder.org>
*
* This file is used to get some basic information
* about the memory layout of the shark we are running
* on. Memory is usually divided in blocks a 8 MB.
* And bootargs are copied from OpenFirmware.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <asm/setup.h>
#include <asm/page.h>
asmlinkage void
create_params (unsigned long *buffer)
{
/* Is there a better address? Also change in mach-shark/arch.c */
struct tag *tag = (struct tag *) 0x08003000;
int j,i,m,k,nr_banks,size;
unsigned char *c;
/* Head of the taglist */
tag->hdr.tag = ATAG_CORE;
tag->hdr.size = tag_size(tag_core);
tag->u.core.flags = FLAG_READONLY;
tag->u.core.pagesize = PAGE_SIZE;
tag->u.core.rootdev = 0;
/* Build up one tagged block for each memory region */
size=0;
nr_banks=(unsigned int) buffer[0];
for (j=0;j<nr_banks;j++){
/* search the lowest address and put it into the next entry */
/* not a fast sort algorithm, but there are at most 8 entries */
/* and this is used only once anyway */
m=0xffffffff;
for (i=0;i<(unsigned int) buffer[0];i++){
if (buffer[2*i+1]<m) {
m=buffer[2*i+1];
k=i;
}
}
tag = tag_next(tag);
tag->hdr.tag = ATAG_MEM;
tag->hdr.size = tag_size(tag_mem32);
tag->u.mem.size = buffer[2*k+2];
tag->u.mem.start = buffer[2*k+1];
size += buffer[2*k+2];
buffer[2*k+1]=0xffffffff; /* mark as copied */
}
/* The command line */
tag = tag_next(tag);
tag->hdr.tag = ATAG_CMDLINE;
c=(unsigned char *)(&buffer[34]);
j=0;
while (*c) tag->u.cmdline.cmdline[j++]=*c++;
tag->u.cmdline.cmdline[j]=0;
tag->hdr.size = (j + 7 + sizeof(struct tag_header)) >> 2;
/* Hardware revision */
tag = tag_next(tag);
tag->hdr.tag = ATAG_REVISION;
tag->hdr.size = tag_size(tag_revision);
tag->u.revision.rev = ((unsigned char) buffer[33])-'0';
/* End of the taglist */
tag = tag_next(tag);
tag->hdr.tag = 0;
tag->hdr.size = 0;
}
typedef int (*ofw_handle_t)(void *);
/* Everything below is called with a wrong MMU setting.
* This means: no string constants, no initialization of
* arrays, no global variables! This is ugly but I didn't
* want to write this in assembler :-)
*/
int
of_decode_int(const unsigned char *p)
{
unsigned int i = *p++ << 8;
i = (i + *p++) << 8;
i = (i + *p++) << 8;
return (i + *p);
}
int
OF_finddevice(ofw_handle_t openfirmware, char *name)
{
unsigned int args[8];
char service[12];
service[0]='f';
service[1]='i';
service[2]='n';
service[3]='d';
service[4]='d';
service[5]='e';
service[6]='v';
service[7]='i';
service[8]='c';
service[9]='e';
service[10]='\0';
args[0]=(unsigned int)service;
args[1]=1;
args[2]=1;
args[3]=(unsigned int)name;
if (openfirmware(args) == -1)
return -1;
return args[4];
}
int
OF_getproplen(ofw_handle_t openfirmware, int handle, char *prop)
{
unsigned int args[8];
char service[12];
service[0]='g';
service[1]='e';
service[2]='t';
service[3]='p';
service[4]='r';
service[5]='o';
service[6]='p';
service[7]='l';
service[8]='e';
service[9]='n';
service[10]='\0';
args[0] = (unsigned int)service;
args[1] = 2;
args[2] = 1;
args[3] = (unsigned int)handle;
args[4] = (unsigned int)prop;
if (openfirmware(args) == -1)
return -1;
return args[5];
}
int
OF_getprop(ofw_handle_t openfirmware, int handle, char *prop, void *buf, unsigned int buflen)
{
unsigned int args[8];
char service[8];
service[0]='g';
service[1]='e';
service[2]='t';
service[3]='p';
service[4]='r';
service[5]='o';
service[6]='p';
service[7]='\0';
args[0] = (unsigned int)service;
args[1] = 4;
args[2] = 1;
args[3] = (unsigned int)handle;
args[4] = (unsigned int)prop;
args[5] = (unsigned int)buf;
args[6] = buflen;
if (openfirmware(args) == -1)
return -1;
return args[7];
}
asmlinkage void ofw_init(ofw_handle_t o, int *nomr, int *pointer)
{
int phandle,i,mem_len,buffer[32];
char temp[15];
temp[0]='/';
temp[1]='m';
temp[2]='e';
temp[3]='m';
temp[4]='o';
temp[5]='r';
temp[6]='y';
temp[7]='\0';
phandle=OF_finddevice(o,temp);
temp[0]='r';
temp[1]='e';
temp[2]='g';
temp[3]='\0';
mem_len = OF_getproplen(o,phandle, temp);
OF_getprop(o,phandle, temp, buffer, mem_len);
*nomr=mem_len >> 3;
for (i=0; i<=mem_len/4; i++) pointer[i]=of_decode_int((const unsigned char *)&buffer[i]);
temp[0]='/';
temp[1]='c';
temp[2]='h';
temp[3]='o';
temp[4]='s';
temp[5]='e';
temp[6]='n';
temp[7]='\0';
phandle=OF_finddevice(o,temp);
temp[0]='b';
temp[1]='o';
temp[2]='o';
temp[3]='t';
temp[4]='a';
temp[5]='r';
temp[6]='g';
temp[7]='s';
temp[8]='\0';
mem_len = OF_getproplen(o,phandle, temp);
OF_getprop(o,phandle, temp, buffer, mem_len);
if (mem_len > 128) mem_len=128;
for (i=0; i<=mem_len/4; i++) pointer[i+33]=buffer[i];
pointer[i+33]=0;
temp[0]='/';
temp[1]='\0';
phandle=OF_finddevice(o,temp);
temp[0]='b';
temp[1]='a';
temp[2]='n';
temp[3]='n';
temp[4]='e';
temp[5]='r';
temp[6]='-';
temp[7]='n';
temp[8]='a';
temp[9]='m';
temp[10]='e';
temp[11]='\0';
mem_len = OF_getproplen(o,phandle, temp);
OF_getprop(o,phandle, temp, buffer, mem_len);
(unsigned char) pointer[32] = ((unsigned char *) buffer)[mem_len-2];
}
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