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/*
* Procedures for interfacing to the Open Firmware PROM on
* Power Macintosh computers.
*
* Paul Mackerras October 1996.
* Copyright (C) 1996 Paul Mackerras.
*/
#include <stdarg.h>
#include "prom.h"
#include "quik.h"
#define getpromprop(node, name, buf, len) \
((int)call_prom("getprop", 4, 1, (node), (name), (buf), (len)))
ihandle prom_stdin;
ihandle prom_stdout;
ihandle prom_chosen;
ihandle prom_options;
ihandle prom_mmu;
struct prom_args {
char *service;
int nargs;
int nret;
void *args[10];
} prom_args;
void (*prom_entry)(void *);
void
prom_exit()
{
struct prom_args args;
args.service = "exit";
args.nargs = 0;
args.nret = 0;
prom_entry(&args);
for (;;) /* should never get here */
;
}
void *
call_prom(char *service, int nargs, int nret, ...)
{
va_list list;
int i;
prom_args.service = service;
prom_args.nargs = nargs;
prom_args.nret = nret;
va_start(list, nret);
for (i = 0; i < nargs; ++i)
prom_args.args[i] = va_arg(list, void *);
va_end(list);
for (i = 0; i < nret; ++i)
prom_args.args[i + nargs] = 0;
prom_entry(&prom_args);
return prom_args.args[nargs];
}
void
prom_print(char *msg)
{
char *p, *q;
char *crlf = "\r\n";
for (p = msg; *p != 0; p = q) {
for (q = p; *q != 0 && *q != '\n'; ++q)
;
if (q > p)
call_prom("write", 3, 1, prom_stdout, p, q - p);
if (*q != 0) {
++q;
call_prom("write", 3, 1, prom_stdout, crlf, 2);
}
}
}
int
prom_map(unsigned int phys, unsigned int virt, unsigned int size)
{
struct prom_args {
char *service;
int nargs;
int nret;
char *method;
ihandle mmu_ihandle;
int misc;
unsigned int size;
unsigned int virt;
unsigned int phys;
int ret0;
} args;
if (prom_mmu == 0) {
qprintf("map() called, no MMU found\n");
return -1;
}
args.service = "call-method";
args.nargs = 6;
args.nret = 1;
args.method = "map";
args.mmu_ihandle = prom_mmu;
args.misc = 0;
args.phys = phys;
args.virt = virt;
args.size = size;
prom_entry(&args);
return (int)args.ret0;
}
int
putchar(int c)
{
char ch = c;
if (c == '\n')
putchar('\r');
return (int) call_prom("write", 3, 1, prom_stdout, &ch, 1);
}
int
getchar()
{
char ch;
int r;
while ((r = (int) call_prom("read", 3, 1, prom_stdin, &ch, 1)) == 0)
;
return r > 0? ch: -1;
}
int
nbgetchar()
{
char ch;
return (int) call_prom("read", 3, 1, prom_stdin, &ch, 1) > 0? ch: -1;
}
void
prom_init(void (*pp)(void *))
{
prom_entry = pp;
/* First get a handle for the stdout device */
prom_chosen = call_prom("finddevice", 1, 1, "/chosen");
if (prom_chosen == (void *)-1)
prom_exit();
getpromprop(prom_chosen, "stdout", &prom_stdout, sizeof(prom_stdout));
getpromprop(prom_chosen, "stdin", &prom_stdin, sizeof(prom_stdin));
getpromprop(prom_chosen, "mmu", &prom_mmu, sizeof(prom_mmu));
prom_options = call_prom("finddevice", 1, 1, "/options");
}
void
prom_get_chosen(char *name, char *buf, int buflen)
{
buf[0] = 0;
getpromprop(prom_chosen, name, buf, buflen);
}
void
prom_get_options(char *name, char *buf, int buflen)
{
buf[0] = 0;
if (prom_options != (void *) -1)
getpromprop(prom_options, name, buf, buflen);
}
int
get_ms()
{
return (int) call_prom("milliseconds", 0, 1);
}
void
prom_pause()
{
call_prom("enter", 0, 0);
}
void
set_bootargs(char *params)
{
call_prom("setprop", 4, 1, prom_chosen, "bootargs", params,
qstrlen(params) + 1);
}
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