Reorganize option rom (+linux kernel) loading.

This patch adds infrastructure to maintain memory regions which must be
restored on reset.  That includes roms (vga bios and option roms on pc),
but is also used when loading linux kernels directly.  Features:

  - loading files is supported.
  - passing blobs is supported.
  - target address range is supported (for optionrom area).
  - fixed target memory address is supported (linux kernel).

New in v2:
  - writes to ROM are done only at initial boot.
  - also handle aout and uimage loaders.
  - drop unused fread_targphys() function.

The final memory layout is created once all memory regions are
registered.  The option roms get addresses assigned and the
registered regions are checked against overlaps.  Finally all data
is copyed to the guest memory.

Advantages:

  (1) Filling memory on initial boot and on reset takes the same
      code path, making reset more robust.
  (2) The need to keep track of the option rom load address is gone.
  (3) Due to (2) option roms can be loaded outside pc_init().  This
      allows to move the pxe rom loading into the nic drivers for
      example.

Additional bonus:  There is a 'info roms' monitor command now.

The patch also switches over pc.c and removes the
option_rom_setup_reset() and load_option_rom() functions.

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

1 files changed, 197 insertions, 57 deletions

diff --git a/hw/loader.c b/hw/loader.c
index 5d83a66..c436ec6 100644
--- a/hw/loader.c
+++ b/hw/loader.c
@@ -44,6 +44,7 @@
 
 #include "hw.h"
 #include "disas.h"
+#include "monitor.h"
 #include "sysemu.h"
 #include "uboot_image.h"
 #include "loader.h"
@@ -80,66 +81,31 @@ int load_image(const char *filename, uint8_t *addr)
     return size;
 }
 
-/* return the amount read, just like fread.  0 may mean error or eof */
-int fread_targphys(target_phys_addr_t dst_addr, size_t nbytes, FILE *f)
-{
-    uint8_t buf[4096];
-    target_phys_addr_t dst_begin = dst_addr;
-    size_t want, did;
-
-    while (nbytes) {
-	want = nbytes > sizeof(buf) ? sizeof(buf) : nbytes;
-	did = fread(buf, 1, want, f);
-
-	cpu_physical_memory_write_rom(dst_addr, buf, did);
-	dst_addr += did;
-	nbytes -= did;
-	if (did != want)
-	    break;
-    }
-    return dst_addr - dst_begin;
-}
-
-/* returns 0 on error, 1 if ok */
-int fread_targphys_ok(target_phys_addr_t dst_addr, size_t nbytes, FILE *f)
-{
-    return fread_targphys(dst_addr, nbytes, f) == nbytes;
-}
-
 /* read()-like version */
-int read_targphys(int fd, target_phys_addr_t dst_addr, size_t nbytes)
+int read_targphys(const char *name,
+                  int fd, target_phys_addr_t dst_addr, size_t nbytes)
 {
-    uint8_t buf[4096];
-    target_phys_addr_t dst_begin = dst_addr;
-    size_t want, did;
-
-    while (nbytes) {
-	want = nbytes > sizeof(buf) ? sizeof(buf) : nbytes;
-	did = read(fd, buf, want);
-	if (did != want) break;
-
-	cpu_physical_memory_write_rom(dst_addr, buf, did);
-	dst_addr += did;
-	nbytes -= did;
-    }
-    return dst_addr - dst_begin;
+    uint8_t *buf;
+    size_t did;
+
+    buf = qemu_malloc(nbytes);
+    did = read(fd, buf, nbytes);
+    if (did > 0)
+        rom_add_blob_fixed("read", buf, did, dst_addr);
+    qemu_free(buf);
+    return did;
 }
 
 /* return the size or -1 if error */
 int load_image_targphys(const char *filename,
 			target_phys_addr_t addr, int max_sz)
 {
-    FILE *f;
-    size_t got;
-
-    f = fopen(filename, "rb");
-    if (!f) return -1;
-
-    got = fread_targphys(addr, max_sz, f);
-    if (ferror(f)) { fclose(f); return -1; }
-    fclose(f);
+    int size;
 
-    return got;
+    size = get_image_size(filename);
+    if (size > 0)
+        rom_add_file_fixed(filename, addr);
+    return size;
 }
 
 void pstrcpy_targphys(target_phys_addr_t dest, int buf_size,
@@ -231,7 +197,7 @@ int load_aout(const char *filename, target_phys_addr_t addr, int max_sz,
         if (e.a_text + e.a_data > max_sz)
             goto fail;
 	lseek(fd, N_TXTOFF(e), SEEK_SET);
-	size = read_targphys(fd, addr, e.a_text + e.a_data);
+	size = read_targphys(filename, fd, addr, e.a_text + e.a_data);
 	if (size < 0)
 	    goto fail;
 	break;
@@ -239,10 +205,10 @@ int load_aout(const char *filename, target_phys_addr_t addr, int max_sz,
         if (N_DATADDR(e, target_page_size) + e.a_data > max_sz)
             goto fail;
 	lseek(fd, N_TXTOFF(e), SEEK_SET);
-	size = read_targphys(fd, addr, e.a_text);
+	size = read_targphys(filename, fd, addr, e.a_text);
 	if (size < 0)
 	    goto fail;
-        ret = read_targphys(fd, addr + N_DATADDR(e, target_page_size),
+        ret = read_targphys(filename, fd, addr + N_DATADDR(e, target_page_size),
                             e.a_data);
 	if (ret < 0)
 	    goto fail;
@@ -343,10 +309,10 @@ int load_elf(const char *filename, int64_t address_offset,
 
     lseek(fd, 0, SEEK_SET);
     if (e_ident[EI_CLASS] == ELFCLASS64) {
-        ret = load_elf64(fd, address_offset, must_swab, pentry,
+        ret = load_elf64(filename, fd, address_offset, must_swab, pentry,
                          lowaddr, highaddr, elf_machine, clear_lsb);
     } else {
-        ret = load_elf32(fd, address_offset, must_swab, pentry,
+        ret = load_elf32(filename, fd, address_offset, must_swab, pentry,
                          lowaddr, highaddr, elf_machine, clear_lsb);
     }
 
@@ -531,7 +497,7 @@ int load_uimage(const char *filename, target_phys_addr_t *ep,
         hdr->ih_size = bytes;
     }
 
-    cpu_physical_memory_write_rom(hdr->ih_load, data, hdr->ih_size);
+    rom_add_blob_fixed(filename, data, hdr->ih_size, hdr->ih_load);
 
     if (loadaddr)
         *loadaddr = hdr->ih_load;
@@ -544,3 +510,177 @@ out:
     close(fd);
     return ret;
 }
+
+/*
+ * Functions for reboot-persistent memory regions.
+ *  - used for vga bios and option roms.
+ *  - also linux kernel (-kernel / -initrd).
+ */
+
+typedef struct Rom Rom;
+
+struct Rom {
+    char *name;
+    char *path;
+    size_t romsize;
+    uint8_t *data;
+    int align;
+    int isrom;
+
+    target_phys_addr_t min;
+    target_phys_addr_t max;
+    target_phys_addr_t addr;
+    QTAILQ_ENTRY(Rom) next;
+};
+
+static QTAILQ_HEAD(, Rom) roms = QTAILQ_HEAD_INITIALIZER(roms);
+
+static void rom_insert(Rom *rom)
+{
+    Rom *item;
+
+    /* list is ordered by load address */
+    QTAILQ_FOREACH(item, &roms, next) {
+        if (rom->min >= item->min)
+            continue;
+        QTAILQ_INSERT_BEFORE(item, rom, next);
+        return;
+    }
+    QTAILQ_INSERT_TAIL(&roms, rom, next);
+}
+
+int rom_add_file(const char *file,
+                 target_phys_addr_t min, target_phys_addr_t max, int align)
+{
+    Rom *rom;
+    int rc, fd = -1;
+
+    rom = qemu_mallocz(sizeof(*rom));
+    rom->name = qemu_strdup(file);
+    rom->path = qemu_find_file(QEMU_FILE_TYPE_BIOS, rom->name);
+    if (rom->path == NULL) {
+        fprintf(stderr, "Could not find option rom '%s'\n", rom->name);
+        goto err;
+    }
+
+    fd = open(rom->path, O_RDONLY);
+    if (fd == -1) {
+        fprintf(stderr, "Could not open option rom '%s': %s\n",
+                rom->path, strerror(errno));
+        goto err;
+    }
+
+    rom->align   = align;
+    rom->min     = min;
+    rom->max     = max;
+    rom->romsize = lseek(fd, 0, SEEK_END);
+    rom->data    = qemu_mallocz(rom->romsize);
+    lseek(fd, 0, SEEK_SET);
+    rc = read(fd, rom->data, rom->romsize);
+    if (rc != rom->romsize) {
+        fprintf(stderr, "rom: file %-20s: read error: rc=%d (expected %zd)\n",
+                rom->name, rc, rom->romsize);
+        goto err;
+    }
+    close(fd);
+    rom_insert(rom);
+    return 0;
+
+err:
+    if (fd != -1)
+        close(fd);
+    qemu_free(rom->data);
+    qemu_free(rom->path);
+    qemu_free(rom->name);
+    qemu_free(rom);
+    return -1;
+}
+
+int rom_add_blob(const char *name, const void *blob, size_t len,
+                 target_phys_addr_t min, target_phys_addr_t max, int align)
+{
+    Rom *rom;
+
+    rom = qemu_mallocz(sizeof(*rom));
+    rom->name    = qemu_strdup(name);
+    rom->align   = align;
+    rom->min     = min;
+    rom->max     = max;
+    rom->romsize = len;
+    rom->data    = qemu_mallocz(rom->romsize);
+    memcpy(rom->data, blob, len);
+    rom_insert(rom);
+    return 0;
+}
+
+static void rom_reset(void *unused)
+{
+    Rom *rom;
+
+    QTAILQ_FOREACH(rom, &roms, next) {
+        if (rom->data == NULL)
+            continue;
+        cpu_physical_memory_write_rom(rom->addr, rom->data, rom->romsize);
+        if (rom->isrom) {
+            /* rom needs to be written only once */
+            qemu_free(rom->data);
+            rom->data = NULL;
+        }
+    }
+}
+
+int rom_load_all(void)
+{
+    target_phys_addr_t addr = 0;
+    int memtype;
+    Rom *rom;
+
+    QTAILQ_FOREACH(rom, &roms, next) {
+        if (addr < rom->min)
+            addr = rom->min;
+        if (rom->max) {
+            /* load address range */
+            if (rom->align) {
+                addr += (rom->align-1);
+                addr &= ~(rom->align-1);
+            }
+            if (addr + rom->romsize > rom->max) {
+                fprintf(stderr, "rom: out of memory (rom %s, "
+                        "addr 0x" TARGET_FMT_plx
+                        ", size 0x%zx, max 0x" TARGET_FMT_plx ")\n",
+                        rom->name, addr, rom->romsize, rom->max);
+                return -1;
+            }
+        } else {
+            /* fixed address requested */
+            if (addr != rom->min) {
+                fprintf(stderr, "rom: requested regions overlap "
+                        "(rom %s. free=0x" TARGET_FMT_plx
+                        ", addr=0x" TARGET_FMT_plx ")\n",
+                        rom->name, addr, rom->min);
+                return -1;
+            }
+        }
+        rom->addr = addr;
+        addr += rom->romsize;
+        memtype = cpu_get_physical_page_desc(rom->addr) & (3 << IO_MEM_SHIFT);
+        if (memtype == IO_MEM_ROM)
+            rom->isrom = 1;
+    }
+    qemu_register_reset(rom_reset, NULL);
+    rom_reset(NULL);
+    return 0;
+}
+
+void do_info_roms(Monitor *mon)
+{
+    Rom *rom;
+
+    QTAILQ_FOREACH(rom, &roms, next) {
+        monitor_printf(mon, "addr=" TARGET_FMT_plx
+                       " size=0x%06zx mem=%s name=\"%s\" \n",
+                       rom->addr, rom->romsize,
+                       rom->isrom ? "rom" : "ram",
+                       rom->name);
+    }
+}