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hw/arm/boot: Don't assume RAM starts at address zero 

In the Arm kernel/initrd loading code, in some places we make the
incorrect assumption that info->ram_size can be treated as the
address of the end of RAM, as for instance when we calculate the
available space for the initrd using "info->ram_size - info->initrd_start".
This is wrong, because many Arm boards (including "virt") specify
a non-zero info->loader_start to indicate that their RAM area
starts at a non-zero physical address.

Correct the places which make this incorrect assumption.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Message-id: 20190516144733.32399-2-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2019-05-16 15:47:30 +01:00
parent 5d0e569447
commit e70af24b42
1 changed files with 4 additions and 5 deletions
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9
hw/arm/boot.c
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@ -977,6 +977,7 @@ static void arm_setup_direct_kernel_boot(ARMCPU *cpu,
int elf_machine;
hwaddr entry;
static const ARMInsnFixup *primary_loader;
uint64_t ram_end = info->loader_start + info->ram_size;
if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) {
primary_loader = bootloader_aarch64;
@ -1048,8 +1049,7 @@ static void arm_setup_direct_kernel_boot(ARMCPU *cpu,
/* 32-bit ARM */
entry = info->loader_start + KERNEL_LOAD_ADDR;
kernel_size = load_image_targphys_as(info->kernel_filename, entry,
info->ram_size - KERNEL_LOAD_ADDR,
as);
ram_end - KERNEL_LOAD_ADDR, as);
is_linux = 1;
}
if (kernel_size < 0) {
@ -1063,12 +1063,11 @@ static void arm_setup_direct_kernel_boot(ARMCPU *cpu,
if (info->initrd_filename) {
initrd_size = load_ramdisk_as(info->initrd_filename,
info->initrd_start,
info->ram_size - info->initrd_start,
as);
ram_end - info->initrd_start, as);
if (initrd_size < 0) {
initrd_size = load_image_targphys_as(info->initrd_filename,
info->initrd_start,
info->ram_size -
ram_end -
info->initrd_start,
as);
}