[Xen-changelog] This patch adjusts the plan9 loader to start "physical" ram at

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 7032428bc8207ecbc409d33d9248a60e0dcbf5d7
# Parent  331c256d8e5c31fba77d3046817aae49a126d5c2
This patch adjusts the plan9 loader to start "physical" ram at
0x80000000 virtual rather than the virtual address of the kernel
image (which is higher).

Tim Newsham

diff -r 331c256d8e5c -r 7032428bc820 tools/libxc/xc_load_aout9.c
--- a/tools/libxc/xc_load_aout9.c       Wed Aug 31 08:43:57 2005
+++ b/tools/libxc/xc_load_aout9.c       Wed Aug 31 08:45:10 2005
@@ -15,6 +15,8 @@
 
 #define round_pgup(_p)    (((_p)+(PAGE_SIZE-1))&PAGE_MASK)
 #define round_pgdown(_p)  ((_p)&PAGE_MASK)
+#define KZERO             0x80000000
+#define KOFFSET(_p)       ((_p)&~KZERO)
 
 static int parseaout9image(char *, unsigned long, struct domain_setup_info *);
 static int loadaout9image(char *, unsigned long, int, u32, unsigned long *, 
struct domain_setup_info *);
@@ -63,7 +65,7 @@
     txtsz = round_pgup(ehdr.text);
     end = start + txtsz + ehdr.data + ehdr.bss;
 
-    dsi->v_start       = start;
+    dsi->v_start       = KZERO;
     dsi->v_kernstart   = start;
     dsi->v_kernend     = end;
     dsi->v_kernentry   = ehdr.entry;
@@ -83,19 +85,19 @@
     struct domain_setup_info *dsi)
 {
     struct Exec ehdr;
-    unsigned long txtsz;
+    unsigned long start, txtsz;
 
     if (!get_header(image, image_size, &ehdr)) {
         ERROR("Kernel image does not have a a.out9 header.");
         return -EINVAL;
     }
 
+    start = round_pgdown(ehdr.entry);
     txtsz = round_pgup(ehdr.text);
     copyout(xch, dom, parray, 
-            0, image, sizeof ehdr + ehdr.text);
+            start, image, sizeof ehdr + ehdr.text);
     copyout(xch, dom, parray, 
-            txtsz, image + sizeof ehdr + ehdr.text, ehdr.data);
-    /* XXX zeroing of BSS needed? */
+            start+txtsz, image + sizeof ehdr + ehdr.text, ehdr.data);
 
     /* XXX load symbols */
 
@@ -110,13 +112,14 @@
 copyout(
     int xch, u32 dom,
     unsigned long *parray,
-    unsigned long off,
+    unsigned long addr,
     void *buf,
     int sz)
 {
-    unsigned long pgoff, chunksz;
+    unsigned long pgoff, chunksz, off;
     void *pg;
 
+    off = KOFFSET(addr);
     while (sz > 0) {
         pgoff = off & (PAGE_SIZE-1);
         chunksz = sz;

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