shithub: riscv

Download patch

ref: 2020190f945dbc264963abec22659df95cd61f04
parent: 153f96ebc6b8a155f2a619faa54cfe11163f75c2
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Sat Nov 1 20:32:46 EDT 2014 

pc, pc64: more sanity checking for lowraminit()


--- a/sys/src/9/pc/memory.c
+++ b/sys/src/9/pc/memory.c
@@ -388,6 +388,8 @@
 	x = PADDR(CPU0END);
 	bda = (uchar*)KADDR(0x400);
 	pa = ((bda[0x14]<<8)|bda[0x13])*KB;
+	if(pa > 640*KB)
+		pa = 640*KB;
 	if(x < pa){
 		mapfree(&rmapram, x, pa-x);
 		memset(KADDR(x), 0, pa-x);		/* keep us honest */
--- a/sys/src/9/pc64/memory.c
+++ b/sys/src/9/pc64/memory.c
@@ -386,6 +386,8 @@
 	x = PADDR(CPU0END);
 	bda = (uchar*)KADDR(0x400);
 	pa = ((bda[0x14]<<8)|bda[0x13])*KB;
+	if(pa > 640*KB)
+		pa = 640*KB;
 	if(x < pa){
 		mapfree(&rmapram, x, pa-x);
 		memset(KADDR(x), 0, pa-x);		/* keep us honest */