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/* idprom.c: Routines to load the idprom into kernel addresses and
* interpret the data contained within.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
*/
#include <linux/kernel.h>
#include <asm/types.h>
#include <asm/openprom.h>
#include <asm/idprom.h>
struct idp_struct idprom;
extern int num_segmaps, num_contexts;
void get_idprom(void)
{
char* idp_addr;
char* knl_idp_addr;
int i;
idp_addr = (char *)IDPROM_ADDR;
knl_idp_addr = (char *) &idprom;
for(i = 0; i<IDPROM_SIZE; i++)
*knl_idp_addr++ = *idp_addr++;
return;
}
/* find_vac_size() returns the number of bytes in the VAC (virtual
* address cache) on this machine.
*/
int
find_vac_size(void)
{
int vac_prop_len;
int vacsize = 0;
int node_root;
node_root = (*(romvec->pv_nodeops->no_nextnode))(0);
vac_prop_len = (*(romvec->pv_nodeops->no_proplen))(node_root, "vac-size");
if(vac_prop_len != -1)
{
(*(romvec->pv_nodeops->no_getprop))(node_root, "vac-size", (char *) &vacsize);
return vacsize;
}
else
{
/* The prom node functions can't help, do it via idprom struct */
switch(idprom.id_machtype)
{
case 0x51:
case 0x52:
case 0x53:
case 0x54:
case 0x55:
case 0x56:
case 0x57:
return 65536;
default:
return -1;
}
};
}
/* find_vac_linesize() returns the size in bytes of the VAC linesize */
int
find_vac_linesize(void)
{
int vac_prop_len;
int vaclinesize = 0;
int node_root;
node_root = (*(romvec->pv_nodeops->no_nextnode))(0);
vac_prop_len = (*(romvec->pv_nodeops->no_proplen))(node_root, "vac-linesize");
if(vac_prop_len != -1)
{
(*(romvec->pv_nodeops->no_getprop))(node_root, "vac-linesize",
(char *) &vaclinesize);
return vaclinesize;
}
else
{
/* The prom node functions can't help, do it via idprom struct */
switch(idprom.id_machtype)
{
case 0x51:
case 0x52:
case 0x53:
case 0x54:
return 16;
case 0x55:
case 0x56:
case 0x57:
return 32;
default:
return -1;
}
};
}
int
find_vac_hwflushes(void)
{
register int len, node_root;
int tmp1, tmp2;
node_root = (*(romvec->pv_nodeops->no_nextnode))(0);
len = (*(romvec->pv_nodeops->no_proplen))(node_root, "vac_hwflush");
#ifdef DEBUG_IDPROM
printf("DEBUG: find_vac_hwflushes: proplen vac_hwflush=0x%x\n", len);
#endif
/* Sun 4/75 has typo in prom_node, it's a dash instead of an underscore
* in the property name. :-(
*/
len |= (*(romvec->pv_nodeops->no_proplen))(node_root, "vac-hwflush");
#ifdef DEBUG_IDPROM
printf("DEBUG: find_vac_hwflushes: proplen vac-hwflush=0x%x\n", len);
#endif
len = (*(romvec->pv_nodeops->no_getprop))(node_root,"vac_hwflush",
(char *) &tmp1);
if(len != 4) tmp1=0;
len = (*(romvec->pv_nodeops->no_getprop))(node_root, "vac-hwflush",
(char *) &tmp2);
if(len != 4) tmp2=0;
return (tmp1|tmp2);
}
void
find_mmu_num_segmaps(void)
{
register int root_node, len;
root_node = (*(romvec->pv_nodeops->no_nextnode))(0);
len = (*(romvec->pv_nodeops->no_getprop))(root_node, "mmu-npmg",
(char *) &num_segmaps);
#ifdef DEBUG_MMU
printf("find_mmu_num_segmaps: property length = %d\n", len);
#endif
if(len != 4) num_segmaps = 128;
return;
}
void
find_mmu_num_contexts(void)
{
register int root_node, len;
root_node = (*(romvec->pv_nodeops->no_nextnode))(0);
len = (*(romvec->pv_nodeops->no_getprop))(root_node, "mmu-nctx",
(char *) &num_contexts);
#ifdef DEBUG_MMU
printf("find_mmu_num_contexts: property length = %d\n", len);
#endif
if(len != 4) num_contexts = 8;
return;
}
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