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Merge patch series "Fix XIP boot and make XIP testable in QEMU"

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Frederik Haxel <haxel@fzi.de> says:

XIP boot seems to be broken for some time now. A likely reason why no one
seems to have noticed this is that XIP is more difficult to test, as it is
currently not easily testable with QEMU.

These patches fix the XIP boot and allow an XIP build without BUILTIN_DTB,
which in turn makes it easier to test an image with the QEMU virt machine.

* b4-shazam-merge:
  riscv: Allow disabling of BUILTIN_DTB for XIP
  riscv: Fixed wrong register in XIP_FIXUP_FLASH_OFFSET macro
  riscv: Make XIP bootable again

Link: https://lore.kernel.org/r/20231212130116.848530-1-haxel@fzi.de
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Palmer Dabbelt 2024-01-09 19:33:25 -08:00
commit 2bf8acbf54
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GPG Key ID: 2E1319F35FBB1889
4 changed files with 14 additions and 7 deletions
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6
arch/riscv/Kconfig
View File

@ -905,13 +905,13 @@ config RISCV_ISA_FALLBACK
on the replacement properties, "riscv,isa-base" and
"riscv,isa-extensions".
endmenu # "Boot options"
config BUILTIN_DTB
bool
bool "Built-in device tree"
depends on OF && NONPORTABLE
default y if XIP_KERNEL
endmenu # "Boot options"
config PORTABLE
bool
default !NONPORTABLE

2
arch/riscv/include/asm/xip_fixup.h
View File

@ -13,7 +13,7 @@
add \reg, \reg, t0
.endm
.macro XIP_FIXUP_FLASH_OFFSET reg
la t1, __data_loc
la t0, __data_loc
REG_L t1, _xip_phys_offset
sub \reg, \reg, t1
add \reg, \reg, t0

5
arch/riscv/kernel/head.S
View File

@ -88,6 +88,7 @@ relocate_enable_mmu:
/* Compute satp for kernel page tables, but don't load it yet */
srl a2, a0, PAGE_SHIFT
la a1, satp_mode
XIP_FIXUP_OFFSET a1
REG_L a1, 0(a1)
or a2, a2, a1
@ -264,10 +265,12 @@ SYM_CODE_START(_start_kernel)
la sp, _end + THREAD_SIZE
XIP_FIXUP_OFFSET sp
mv s0, a0
mv s1, a1
call __copy_data
/* Restore a0 copy */
/* Restore a0 & a1 copy */
mv a0, s0
mv a1, s1
#endif
#ifndef CONFIG_XIP_KERNEL

8
arch/riscv/mm/init.c
View File

@ -174,6 +174,9 @@ void __init mem_init(void)
/* Limit the memory size via mem. */
static phys_addr_t memory_limit;
#ifdef CONFIG_XIP_KERNEL
#define memory_limit (*(phys_addr_t *)XIP_FIXUP(&memory_limit))
#endif /* CONFIG_XIP_KERNEL */
static int __init early_mem(char *p)
{
@ -952,7 +955,7 @@ static void __init create_fdt_early_page_table(uintptr_t fix_fdt_va,
* setup_vm_final installs the linear mapping. For 32-bit kernel, as the
* kernel is mapped in the linear mapping, that makes no difference.
*/
dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
dtb_early_va = kernel_mapping_pa_to_va(dtb_pa);
#endif
dtb_early_pa = dtb_pa;
@ -1055,9 +1058,9 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
#endif
kernel_map.virt_addr = KERNEL_LINK_ADDR + kernel_map.virt_offset;
kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL);
#ifdef CONFIG_XIP_KERNEL
kernel_map.page_offset = PAGE_OFFSET_L3;
kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR;
kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom);
@ -1067,6 +1070,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom;
#else
kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL);
kernel_map.phys_addr = (uintptr_t)(&_start);
kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr;
#endif