8 files changed, 165 insertions, 58 deletions

diff --git a/sys/boot/i386/libi386/biosmem.c b/sys/boot/i386/libi386/biosmem.c
index 1e4e540396e5..4bab178e4e10 100644
--- a/sys/boot/i386/libi386/biosmem.c
+++ b/sys/boot/i386/libi386/biosmem.c
@@ -1,52 +1,105 @@
-/*
- * mjs copyright
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
  */
 
 /*
  * Obtain memory configuration information from the BIOS
- *
- * Note that we don't try too hard here; knowing the size of
- * base memory and extended memory out to 16 or 64M is enough for
- * the requirements of the bootstrap.
- *
- * We also maintain a pointer to the top of physical memory
- * once called to allow rangechecking of load/copy requests.
  */
 #include <stand.h>
 #include "btxv86.h"
 
 vm_offset_t	memtop;
+u_int32_t	bios_basemem, bios_extmem;
 
-/*
- * Return base memory size in kB.
- */
-int
-getbasemem(void)
-{
-    v86.ctl = 0;
-    v86.addr = 0x12;		/* int 0x12 */
-    v86int();
+#define SMAPSIG	0x534D4150
 
-    return(v86.eax & 0xffff);
-}
+struct smap {
+    u_int64_t	base;
+    u_int64_t	length;
+    u_int32_t	type;
+} __attribute__ ((packed));
 
-/*
- * Return extended memory size in kB
- */
-int
-getextmem(void)
+static struct smap smap;
+
+void
+bios_getmem(void)
 {
-    int		extkb;
-    
-    v86.ctl = 0;
-    v86.addr = 0x15;		/* int 0x15 function 0x88*/
-    v86.eax = 0x8800;
-    v86int();
-    extkb = v86.eax & 0xffff;
-
-    /* Set memtop to actual top or 16M, whicheve is less */
-    memtop = min((0x100000 + (extkb * 1024)), (16 * 1024 * 1024));
-    
-    return(extkb);
-}
+
+    /* Parse system memory map */
+    v86.ebx = 0;
+    do {
+	v86.ctl = V86_FLAGS;
+	v86.addr = 0x15;		/* int 0x15 function 0xe820*/
+	v86.eax = 0xe820;
+	v86.ecx = sizeof(struct smap);
+	v86.edx = SMAPSIG;
+	v86.es = VTOPSEG(&smap);
+	v86.edi = VTOPOFF(&smap);
+	v86int();
+	if ((v86.efl & 1) || (v86.eax != SMAPSIG))
+	    break;
+	/* look for a low-memory segment that's large enough */
+	if ((smap.type == 1) && (smap.base == 0) && (smap.length >= (512 * 1024)))
+	    bios_basemem = smap.length;
+	/* look for the first segment in 'extended' memory */
+	if ((smap.type == 1) && (smap.base == 0x100000)) {
+	    bios_extmem = smap.length;
+	}
+    } while (v86.ebx != 0);
+
+    /* Fall back to the old compatibility function for base memory */
+    if (bios_basemem == 0) {
+	v86.ctl = 0;
+	v86.addr = 0x12;		/* int 0x12 */
+	v86int();
+	
+	bios_basemem = (v86.eax & 0xffff) * 1024;
+    }
+
+    /* Fall back through several compatibility functions for extended memory */
+    if (bios_extmem == 0) {
+	v86.ctl = V86_FLAGS;
+	v86.addr = 0x15;		/* int 0x15 function 0xe801*/
+	v86.eax = 0xe801;
+	v86int();
+	if (!(v86.efl & 1)) {
+	    bios_extmem = ((v86.ecx & 0xffff) + ((v86.edx & 0xffff) * 64)) * 1024;
+	}
+    }
+    if (bios_extmem == 0) {
+	v86.ctl = 0;
+	v86.addr = 0x15;		/* int 0x15 function 0x88*/
+	v86.eax = 0x8800;
+	v86int();
+	bios_extmem = (v86.eax & 0xffff) * 1024;
+    }
+
+    /* Set memtop to actual top of memory */
+    memtop = 0x100000 + bios_extmem;
+
+}    
 
diff --git a/sys/boot/i386/libi386/bootinfo.c b/sys/boot/i386/libi386/bootinfo.c
index 8363b9fd25a1..a8738e12dcc3 100644
--- a/sys/boot/i386/libi386/bootinfo.c
+++ b/sys/boot/i386/libi386/bootinfo.c
@@ -287,8 +287,8 @@ bi_load(char *args, int *howtop, int *bootdevp, vm_offset_t *bip)
         bi.bi_bios_geom[i] = bd_getbigeom(i);
     bi.bi_size = sizeof(bi);
     bi.bi_memsizes_valid = 1;
-    bi.bi_basemem = getbasemem();
-    bi.bi_extmem = getextmem();
+    bi.bi_basemem = bios_basemem / 1024;
+    bi.bi_extmem = bios_extmem / 1024;
 
     /* find the last module in the chain */
     addr = 0;
diff --git a/sys/boot/i386/libi386/bootinfo32.c b/sys/boot/i386/libi386/bootinfo32.c
index 8363b9fd25a1..a8738e12dcc3 100644
--- a/sys/boot/i386/libi386/bootinfo32.c
+++ b/sys/boot/i386/libi386/bootinfo32.c
@@ -287,8 +287,8 @@ bi_load(char *args, int *howtop, int *bootdevp, vm_offset_t *bip)
         bi.bi_bios_geom[i] = bd_getbigeom(i);
     bi.bi_size = sizeof(bi);
     bi.bi_memsizes_valid = 1;
-    bi.bi_basemem = getbasemem();
-    bi.bi_extmem = getextmem();
+    bi.bi_basemem = bios_basemem / 1024;
+    bi.bi_extmem = bios_extmem / 1024;
 
     /* find the last module in the chain */
     addr = 0;
diff --git a/sys/boot/i386/libi386/bootinfo64.c b/sys/boot/i386/libi386/bootinfo64.c
index 8363b9fd25a1..a8738e12dcc3 100644
--- a/sys/boot/i386/libi386/bootinfo64.c
+++ b/sys/boot/i386/libi386/bootinfo64.c
@@ -287,8 +287,8 @@ bi_load(char *args, int *howtop, int *bootdevp, vm_offset_t *bip)
         bi.bi_bios_geom[i] = bd_getbigeom(i);
     bi.bi_size = sizeof(bi);
     bi.bi_memsizes_valid = 1;
-    bi.bi_basemem = getbasemem();
-    bi.bi_extmem = getextmem();
+    bi.bi_basemem = bios_basemem / 1024;
+    bi.bi_extmem = bios_extmem / 1024;
 
     /* find the last module in the chain */
     addr = 0;
diff --git a/sys/boot/i386/libi386/i386_copy.c b/sys/boot/i386/libi386/i386_copy.c
index d0903f1f022f..02f8b8702bfd 100644
--- a/sys/boot/i386/libi386/i386_copy.c
+++ b/sys/boot/i386/libi386/i386_copy.c
@@ -1,6 +1,31 @@
-/*
- * mjs copyright
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
  */
+
 /*
  * MD primitives supporting placement of module data 
  *
@@ -16,8 +41,10 @@
 int
 i386_copyin(void *src, vm_offset_t dest, size_t len)
 {
-    if (dest + len >= memtop)
-	return(0);
+    if (dest + len >= memtop) {
+	errno = EFBIG;
+	return(-1);
+    }
 
     bcopy(src, PTOV(dest), len);
     return(len);
@@ -26,8 +53,10 @@ i386_copyin(void *src, vm_offset_t dest, size_t len)
 int
 i386_copyout(vm_offset_t src, void *dest, size_t len)
 {
-    if (src + len >= memtop)
-	return(0);
+    if (src + len >= memtop) {
+	errno = EFBIG;
+	return(-1);
+    }
     
     bcopy(PTOV(src), dest, len);
     return(len);
diff --git a/sys/boot/i386/libi386/libi386.h b/sys/boot/i386/libi386/libi386.h
index 1868faa9c2b6..479f95cdfe77 100644
--- a/sys/boot/i386/libi386/libi386.h
+++ b/sys/boot/i386/libi386/libi386.h
@@ -72,8 +72,9 @@ extern int		i386_copyin(void *src, vm_offset_t dest, size_t len);
 extern int		i386_copyout(vm_offset_t src, void *dest, size_t len);
 extern int		i386_readin(int fd, vm_offset_t dest, size_t len);
 
-extern int		getbasemem(void);
-extern int		getextmem(void);
+extern void		bios_getmem(void);
+extern u_int32_t	bios_basemem;				/* base memory in bytes */
+extern u_int32_t	bios_extmem;				/* extended memory in bytes */
 extern vm_offset_t	memtop;
 
 extern void		gateA20(void);
diff --git a/sys/boot/i386/libi386/time.c b/sys/boot/i386/libi386/time.c
index a3f0f72e2178..0a3981fac4ba 100644
--- a/sys/boot/i386/libi386/time.c
+++ b/sys/boot/i386/libi386/time.c
@@ -1,5 +1,29 @@
-/*
- * mjs copyright
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
  */
 
 #include <stand.h>
diff --git a/sys/boot/i386/loader/main.c b/sys/boot/i386/loader/main.c
index 327773820633..3e3771ef7f89 100644
--- a/sys/boot/i386/loader/main.c
+++ b/sys/boot/i386/loader/main.c
@@ -80,10 +80,9 @@ main(void)
 
     /* 
      * Initialise the heap as early as possible.  Once this is done, malloc() is usable.
-     *
-     * XXX better to locate end of memory and use that
      */
-    setheap((void *)end, (void *)(end + (384 * 1024)));
+    bios_getmem();
+    setheap((void *)end, (void *)bios_basemem);
     
     /* 
      * XXX Chicken-and-egg problem; we want to have console output early, but some
@@ -108,9 +107,10 @@ main(void)
     for (i = 0; devsw[i] != NULL; i++)
 	if (devsw[i]->dv_init != NULL)
 	    (devsw[i]->dv_init)();
+    printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
 
     printf("\n");
-    printf("%s, Revision %s  %d/%dkB\n", bootprog_name, bootprog_rev, getbasemem(), getextmem());
+    printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
     printf("(%s, %s)\n", bootprog_maker, bootprog_date);
 
     extract_currdev();				/* set $currdev and $loaddev */