ref: 316d8ad76b13583848db2d93187a921c18ee275c
parent: 06c8a5b3911239937e0c99634e25cfc7209df436
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Tue Mar 4 17:37:15 EST 2014
pc64: fix segattach the comment about Physseg.size being in pages is wrong, change type to uintptr and correct the comment. change the length parameter of segattach() and isoverlap() to uintptr as well. segments can grow over 4GB in pc64 now and globalsegattach() in devsegment calculates len argument of isoverlap() by s->top - s->bot. note that the syscall still takes 32bit ulong argument for the length! check for integer overflow in segattach(), make sure segment goes not beyond USTKTOP. change PTEMAPMEM constant to uvlong as it is used to calculate SEGMAXSIZE.
--- a/sys/src/9/bcm/main.c
+++ b/sys/src/9/bcm/main.c
@@ -223,7 +223,7 @@
seg.attr = SG_PHYSICAL;
seg.name = "gpio";
seg.pa = (VIRTIO+0x200000);
- seg.size = 1;
+ seg.size = BY2PG;
addphysseg(&seg);
}
--- a/sys/src/9/pc64/mem.h
+++ b/sys/src/9/pc64/mem.h
@@ -132,7 +132,7 @@
/*
* virtual MMU
*/
-#define PTEMAPMEM (1024*1024)
+#define PTEMAPMEM (1ull*MiB)
#define PTEPERTAB (PTEMAPMEM/BY2PG)
#define SEGMAPSIZE 65536
#define SSEGMAPSIZE 16
--- a/sys/src/9/port/portdat.h
+++ b/sys/src/9/port/portdat.h
@@ -389,7 +389,7 @@
ulong attr; /* Segment attributes */
char *name; /* Attach name */
uintptr pa; /* Physical address */
- ulong size; /* Maximum segment size in pages */
+ uintptr size; /* Maximum segment size in bytes */
Page *(*pgalloc)(Segment*, uintptr); /* Allocation if we need it */
void (*pgfree)(Page*);
};
--- a/sys/src/9/port/portfns.h
+++ b/sys/src/9/port/portfns.h
@@ -137,7 +137,7 @@
void isdir(Chan*);
int iseve(void);
int islo(void);
-Segment* isoverlap(Proc*, uintptr, int);
+Segment* isoverlap(Proc*, uintptr, uintptr);
int ispages(void*);
int isphysseg(char*);
void ixsummary(void);
@@ -302,7 +302,7 @@
void schedinit(void);
void (*screenputs)(char*, int);
long seconds(void);
-uintptr segattach(Proc*, ulong, char *, uintptr, ulong);
+uintptr segattach(Proc*, ulong, char *, uintptr, uintptr);
void segclock(uintptr);
void segpage(Segment*, Page*);
int setcolor(ulong, ulong, ulong, ulong);
--- a/sys/src/9/port/segment.c
+++ b/sys/src/9/port/segment.c
@@ -558,7 +558,7 @@
}
Segment*
-isoverlap(Proc *p, uintptr va, int len)
+isoverlap(Proc *p, uintptr va, uintptr len)
{int i;
Segment *ns;
@@ -621,7 +621,7 @@
}
uintptr
-segattach(Proc *p, ulong attr, char *name, uintptr va, ulong len)
+segattach(Proc *p, ulong attr, char *name, uintptr va, uintptr len)
{int sno;
Segment *s, *os;
@@ -671,12 +671,11 @@
error(Enovmem);
va -= len;
}
- va &= ~(BY2PG-1);
- } else {- va &= ~(BY2PG-1);
- if(va == 0 || va >= USTKTOP)
- error(Ebadarg);
}
+
+ va &= ~(BY2PG-1);
+ if(va == 0 || (va+len) > USTKTOP || (va+len) < va)
+ error(Ebadarg);
if(isoverlap(p, va, len) != nil)
error(Esoverlap);