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PPC: calculate kernel,initrd,cmdline locations dynamically 

During testing, I was generating a vmlinux binary that easily occupied
more than 20MB of RAM. Since the current -kernel code loads the initrd
at a fixed address behind the kernel, we were overwriting kernel data
when the kernel got too big.

To finally get rid of the issue, let's calculate the initrd and cmdline
addresses relative to the kernel size, so we can have kernels and initrds
that are as big as they want to - as long as they fit in RAM.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2011-06-15 23:27:19 +02:00
parent 826e7b827c
commit b9e17a3453
3 changed files with 23 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
hw/ppc_mac.h
View File

@ -35,8 +35,7 @@
#define PROM_ADDR 0xfff00000
#define KERNEL_LOAD_ADDR 0x01000000
#define CMDLINE_ADDR 0x027ff000
#define INITRD_LOAD_ADDR 0x02800000
#define KERNEL_GAP 0x00100000
#define ESCC_CLOCK 3686400

15
hw/ppc_newworld.c
View File

@ -120,6 +120,11 @@ static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
return (addr & 0x0fffffff) + KERNEL_LOAD_ADDR;
}
static target_phys_addr_t round_page(target_phys_addr_t addr)
{
return (addr + TARGET_PAGE_SIZE - 1) & TARGET_PAGE_MASK;
}
/* PowerPC Mac99 hardware initialisation */
static void ppc_core99_init (ram_addr_t ram_size,
const char *boot_device,
@ -134,7 +139,7 @@ static void ppc_core99_init (ram_addr_t ram_size,
int unin_memory;
int linux_boot, i;
ram_addr_t ram_offset, bios_offset;
uint32_t kernel_base, initrd_base;
target_phys_addr_t kernel_base, initrd_base, cmdline_base = 0;
long kernel_size, initrd_size;
PCIBus *pci_bus;
MacIONVRAMState *nvr;
@ -220,7 +225,7 @@ static void ppc_core99_init (ram_addr_t ram_size,
}
/* load initrd */
if (initrd_filename) {
initrd_base = INITRD_LOAD_ADDR;
initrd_base = round_page(kernel_base + kernel_size + KERNEL_GAP);
initrd_size = load_image_targphys(initrd_filename, initrd_base,
ram_size - initrd_base);
if (initrd_size < 0) {
@ -228,9 +233,11 @@ static void ppc_core99_init (ram_addr_t ram_size,
initrd_filename);
exit(1);
}
cmdline_base = round_page(initrd_base + initrd_size);
} else {
initrd_base = 0;
initrd_size = 0;
cmdline_base = round_page(kernel_base + kernel_size + KERNEL_GAP);
}
ppc_boot_device = 'm';
} else {
@ -373,8 +380,8 @@ static void ppc_core99_init (ram_addr_t ram_size,
fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, kernel_base);
fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, kernel_size);
if (kernel_cmdline) {
fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_CMDLINE, CMDLINE_ADDR);
pstrcpy_targphys("cmdline", CMDLINE_ADDR, TARGET_PAGE_SIZE, kernel_cmdline);
fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_CMDLINE, cmdline_base);
pstrcpy_targphys("cmdline", cmdline_base, TARGET_PAGE_SIZE, kernel_cmdline);
} else {
fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_CMDLINE, 0);
}

15
hw/ppc_oldworld.c
View File

@ -59,6 +59,11 @@ static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
return (addr & 0x0fffffff) + KERNEL_LOAD_ADDR;
}
static target_phys_addr_t round_page(target_phys_addr_t addr)
{
return (addr + TARGET_PAGE_SIZE - 1) & TARGET_PAGE_MASK;
}
static void ppc_heathrow_init (ram_addr_t ram_size,
const char *boot_device,
const char *kernel_filename,
@ -71,7 +76,7 @@ static void ppc_heathrow_init (ram_addr_t ram_size,
qemu_irq *pic, **heathrow_irqs;
int linux_boot, i;
ram_addr_t ram_offset, bios_offset;
uint32_t kernel_base, initrd_base;
uint32_t kernel_base, initrd_base, cmdline_base = 0;
int32_t kernel_size, initrd_size;
PCIBus *pci_bus;
MacIONVRAMState *nvr;
@ -157,7 +162,7 @@ static void ppc_heathrow_init (ram_addr_t ram_size,
}
/* load initrd */
if (initrd_filename) {
initrd_base = INITRD_LOAD_ADDR;
initrd_base = round_page(kernel_base + kernel_size + KERNEL_GAP);
initrd_size = load_image_targphys(initrd_filename, initrd_base,
ram_size - initrd_base);
if (initrd_size < 0) {
@ -165,9 +170,11 @@ static void ppc_heathrow_init (ram_addr_t ram_size,
initrd_filename);
exit(1);
}
cmdline_base = round_page(initrd_base + initrd_size);
} else {
initrd_base = 0;
initrd_size = 0;
cmdline_base = round_page(kernel_base + kernel_size + KERNEL_GAP);
}
ppc_boot_device = 'm';
} else {
@ -278,8 +285,8 @@ static void ppc_heathrow_init (ram_addr_t ram_size,
fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, kernel_base);
fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, kernel_size);
if (kernel_cmdline) {
fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_CMDLINE, CMDLINE_ADDR);
pstrcpy_targphys("cmdline", CMDLINE_ADDR, TARGET_PAGE_SIZE, kernel_cmdline);
fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_CMDLINE, cmdline_base);
pstrcpy_targphys("cmdline", cmdline_base, TARGET_PAGE_SIZE, kernel_cmdline);
} else {
fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_CMDLINE, 0);
}