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Added support for built in miniroot ramdisk. Define MINIROOTSIZE to be 

the number of blocks to reserve for the ramdisk.
This commit is contained in:
mark 1997-07-31 23:13:12 +00:00
parent 4f2ae66cf0
commit fdcef230ca
1 changed files with 31 additions and 25 deletions
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56
sys/arch/arm32/dev/md_hooks.c
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@ -1,4 +1,4 @@
/* $NetBSD: md_hooks.c,v 1.8 1997/01/26 02:02:09 mark Exp $ */
/* $NetBSD: md_hooks.c,v 1.9 1997/07/31 23:13:12 mark Exp $ */
/*
* Copyright (c) 1995 Gordon W. Ross
@ -38,27 +38,25 @@
#include <dev/md.h>
#ifndef MEMORY_DISK_SIZE
#define MEMORY_DISK_SIZE 0
#endif
extern u_int memory_disc_size;
struct md_conf *bootmd = NULL;
int md_match_hook __P((struct device *parent, void *self, void *aux));
extern int load_memory_disc_from_floppy __P((struct md_conf *md, dev_t dev));
#ifdef MINIROOTSIZE
#define ROOTBYTES (MINIROOTSIZE << DEV_BSHIFT)
/*
* This is called during autoconfig.
* This array will be patched to contain a file-system image.
* See the program: src/distrib/sun3/common/rdsetroot.c
*/
int
md_match_hook(parent, self, aux)
struct device *parent;
void *self;
void *aux;
{
return (1);
}
int md_root_size = ROOTBYTES;
char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n";
#else /* MINIROOTSIZE */
extern u_int memory_disc_size; /* from machdep.c */
static struct md_conf *bootmd = NULL;
extern int load_memory_disc_from_floppy __P((struct md_conf *md, dev_t dev));
#include "fdc.h"
#endif /* MINIROOTSIZE */
void
md_attach_hook(unit, md)
@ -66,17 +64,25 @@ md_attach_hook(unit, md)
struct md_conf *md;
{
if (unit == 0) {
#ifdef MINIROOTSIZE
/* Setup root ramdisk */
md->md_addr = (caddr_t) md_root_image;
md->md_size = (size_t) md_root_size;
md->md_type = MD_KMEM_FIXED;
#else /* MINIROOTSIZE */
#ifdef MEMORY_DISK_SIZE
if (memory_disc_size == 0 && MEMORY_DISK_SIZE)
memory_disc_size = (MEMORY_DISK_SIZE * 1024);
memory_disc_size = (MEMORY_DISK_SIZE << DEV_BSHIFT);
#endif /* MEMORY_DISK_SIZE */
if (memory_disc_size != 0) {
md->md_size = round_page(memory_disc_size);
md->md_addr = (caddr_t)kmem_alloc(kernel_map, memory_disc_size);
md->md_type = MD_KMEM_FIXED;
bootmd = md;
}
#endif /* MINIROOTSIZE */
printf("md%d: allocated %dK (%d blocks)\n", unit, md->md_size / 1024, md->md_size / DEV_BSIZE);
}
printf("md%d: allocated %dK (%d blocks)\n", unit, md->md_size / 1024, md->md_size / DEV_BSIZE);
}
@ -89,11 +95,11 @@ md_open_hook(unit, md)
int unit;
struct md_conf *md;
{
/* I use the memory disc for other testing ... */
#if 0
if (unit == 0) {
/* The root memory disk only works single-user. */
boothowto |= RB_SINGLE;
}
#if !defined(MINIROOTSIZE) && NFDC > 0
load_memory_disc_from_floppy(bootmd, makedev(17, 1)); /* XXX 1.44MB FD */
#endif
}
}