rom loader: fix sparc -kernel boot.

Changes:
(1) register pstrcpy_targphys() in rom list, it is used for kernel
command lines by a number of architectures.
(2) add rom_ptr() function to get a pointer for applying changes
to loaded images.  Needed for example to tell the linux kernel
where it finds the initrd image by updating the header.
(3) make sparc use rom_ptr for initrd setup.

booting sparc-test works now, and 'info roms' shows this:

(qemu) info roms
addr=0000000000000000 size=0x2a3828 mem=ram name="phdr #0: vmlinux-2.6.11+tcx"
addr=00000000007ff000 size=0x00000e mem=ram name="cmdline"
addr=0000000000800000 size=0x400000 mem=ram name="/root/qemu-test/sparc-test/linux.img"
addr=0000000070000000 size=0x0e4000 mem=rom name="phdr #0: /home/kraxel/projects/qemu/build-zfull/pc-bios/openbios-sparc32"

reboot via 'system_reset' works too.

Patchworks-ID: 35262
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 32 insertions, 6 deletions

diff --git a/hw/loader.c b/hw/loader.c
index 03cc7d5f7e..f38b994a51 100644
--- a/hw/loader.c
+++ b/hw/loader.c
@@ -108,20 +108,20 @@ int load_image_targphys(const char *filename,
     return size;
 }
 
-void pstrcpy_targphys(target_phys_addr_t dest, int buf_size,
+void pstrcpy_targphys(const char *name, target_phys_addr_t dest, int buf_size,
                       const char *source)
 {
-    static const uint8_t nul_byte = 0;
     const char *nulp;
+    char *ptr;
 
     if (buf_size <= 0) return;
     nulp = memchr(source, 0, buf_size);
     if (nulp) {
-	cpu_physical_memory_write_rom(dest, (uint8_t *)source,
-                                      (nulp - source) + 1);
+        rom_add_blob_fixed(name, source, (nulp - source) + 1, dest);
     } else {
-	cpu_physical_memory_write_rom(dest, (uint8_t *)source, buf_size - 1);
-	cpu_physical_memory_write_rom(dest, &nul_byte, 1);
+        rom_add_blob_fixed(name, source, buf_size, dest);
+        ptr = rom_ptr(dest + buf_size - 1);
+        *ptr = 0;
     }
 }
 
@@ -672,6 +672,32 @@ int rom_load_all(void)
     return 0;
 }
 
+static Rom *find_rom(target_phys_addr_t addr)
+{
+    Rom *rom;
+
+    QTAILQ_FOREACH(rom, &roms, next) {
+        if (rom->max)
+            continue;
+        if (rom->min > addr)
+            continue;
+        if (rom->min + rom->romsize < addr)
+            continue;
+        return rom;
+    }
+    return NULL;
+}
+
+void *rom_ptr(target_phys_addr_t addr)
+{
+    Rom *rom;
+
+    rom = find_rom(addr);
+    if (!rom || !rom->data)
+        return NULL;
+    return rom->data + (addr - rom->min);
+}
+
 void do_info_roms(Monitor *mon)
 {
     Rom *rom;