nits

README

@@ -6,7 +6,7 @@ ACKNOWLEDGMENTS
 
 xv6 is inspired by John Lions's Commentary on UNIX 6th Edition (Peer
 to Peer Communications; ISBN: 1-57398-013-7; 1st edition (June 14,
-2000)). See also http://pdos.csail.mit.edu/6.828/2007/v6.html, which
+2000)). See also http://pdos.csail.mit.edu/6.828/2012/v6.html, which
 provides pointers to on-line resources for v6.
 
 xv6 borrows code from the following sources:
@@ -15,7 +15,7 @@ xv6 borrows code from the following sources:
     FreeBSD (ioapic.c)
     NetBSD (console.c)
 
-The following people made contributions:
+The following people have made contributions:
     Russ Cox (context switching, locking)
     Cliff Frey (MP)
     Xiao Yu (MP)
@@ -26,7 +26,7 @@ In addition, we are grateful for the patches contributed by Greg
 Price, Yandong Mao, and Hitoshi Mitake.
 
 The code in the files that constitute xv6 is
-Copyright 2006-2011 Frans Kaashoek, Robert Morris, and Russ Cox.
+Copyright 2006-2012 Frans Kaashoek, Robert Morris, and Russ Cox.
 
 ERROR REPORTS
 
@@ -38,13 +38,13 @@ BUILDING AND RUNNING XV6
 To build xv6 on an x86 ELF machine (like Linux or FreeBSD), run "make".
 On non-x86 or non-ELF machines (like OS X, even on x86), you will
 need to install a cross-compiler gcc suite capable of producing x86 ELF
-binaries.  See http://pdos.csail.mit.edu/6.828/2011/tools.html.
+binaries.  See http://pdos.csail.mit.edu/6.828/2012/tools.html.
 Then run "make TOOLPREFIX=i386-jos-elf-".
 
-To run xv6, you can use Bochs or QEMU, both PC simulators.
-Bochs makes debugging easier, but QEMU is much faster. 
-To run in Bochs, run "make bochs" and then type "c" at the bochs prompt.
-To run in QEMU, run "make qemu".
+To run xv6, you can use the Bochs or QEMU PC simulators. Bochs makes
+debugging easier, but QEMU is much faster. To run in Bochs, run "make
+bochs" and then type "c" at the bochs prompt. To run in QEMU, run
+"make qemu".
 
 To create a typeset version of the code, run "make xv6.pdf".  This
 requires the "mpage" utility.  See http://www.mesa.nl/pub/mpage/.

vm.c

@@ -118,10 +118,10 @@ static struct kmap {
   uint phys_end;
   int perm;
 } kmap[] = {
- { (void*)KERNBASE, 0,             EXTMEM,    PTE_W},  // I/O space
- { (void*)KERNLINK, V2P(KERNLINK), V2P(data), 0},      // kernel text+rodata
- { (void*)data,     V2P(data),     PHYSTOP,   PTE_W},  // kernel data+memory
- { (void*)DEVSPACE, DEVSPACE,      0,         PTE_W},  // more devices
+ { (void*)KERNBASE, 0,             EXTMEM,    PTE_W}, // I/O space
+ { (void*)KERNLINK, V2P(KERNLINK), V2P(data), 0},     // kern text+rodata
+ { (void*)data,     V2P(data),     PHYSTOP,   PTE_W}, // kern data+memory
+ { (void*)DEVSPACE, DEVSPACE,      0,         PTE_W}, // more devices
 };
 
 // Set up kernel part of a page table.