[PATCH] RISC-V: Always define XIP_FIXUP
Alex Ghiti
alex at ghiti.fr
Sun May 2 09:14:27 BST 2021
Hi Palmer,
Le 4/29/21 à 12:43 AM, Palmer Dabbelt a écrit :
> On Wed, 28 Apr 2021 01:25:55 PDT (-0700), alex at ghiti.fr wrote:
>> Le 4/27/21 à 11:34 PM, Palmer Dabbelt a écrit :
>>> From: Palmer Dabbelt <palmerdabbelt at google.com>
>>>
>>> XIP depends on MMU, but XIP_FIXUP is defined throughout the kernel in
>>> order to avoid excessive ifdefs. This just makes sure to always define
>>> XIP_FIXIP, which will fix MMU=n builds.
>>
>> A small typo here.
>
> Actually two: "defined" should have been "used". Both are fixed.
>
>>
>>>
>>> Fixes: 44c922572952 ("RISC-V: enable XIP")
>>> Reported-by: Guenter Roeck <linux at roeck-us.net>
>>> Signed-off-by: Palmer Dabbelt <palmerdabbelt at google.com>
>>> ---
>>> arch/riscv/include/asm/pgtable.h | 24 ++++++++++++------------
>>> 1 file changed, 12 insertions(+), 12 deletions(-)
>>>
>>> diff --git a/arch/riscv/include/asm/pgtable.h
>>> b/arch/riscv/include/asm/pgtable.h
>>> index 2f1384e14e31..fd749351f432 100644
>>> --- a/arch/riscv/include/asm/pgtable.h
>>> +++ b/arch/riscv/include/asm/pgtable.h
>>> @@ -73,18 +73,6 @@
>>> #endif
>>> #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
>>>
>>> -#ifdef CONFIG_XIP_KERNEL
>>> -#define XIP_OFFSET SZ_8M
>>> -#define XIP_FIXUP(addr) ({ \
>>> - uintptr_t __a = (uintptr_t)(addr); \
>>> - (__a >= CONFIG_XIP_PHYS_ADDR && __a < CONFIG_XIP_PHYS_ADDR +
>>> SZ_16M) ? \
>>> - __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE -
>>> XIP_OFFSET :\
>>> - __a; \
>>> - })
>>> -#else
>>> -#define XIP_FIXUP(addr) (addr)
>>> -#endif /* CONFIG_XIP_KERNEL */
>>> -
>>> #endif
>>>
>>> #ifndef __ASSEMBLY__
>>> @@ -101,6 +89,18 @@
>>> #include <asm/pgtable-32.h>
>>> #endif /* CONFIG_64BIT */
>>>
>>> +#ifdef CONFIG_XIP_KERNEL
>>> +#define XIP_OFFSET SZ_8M
>>
>>
>> XIP_OFFSET is used in head.S and then this breaks XIP_KERNEL. XIP_OFFSET
>> must live outside the ifndef __ASSEMBLY__.
>
> Thanks, I hadn't even seen XIP_OFFSET. This is fixed in the v2.
>
> Do you have an XIP config that will run on QEMU, and a way to run it? If
> so, can you post a defconfig and some instructions? That'll make it
> easier to test on my end.
I posted a tutorial here on how I test XIP kernel:
https://alexghiti.github.io/xip/XIP.html
If something does not work for you, please tell me.
Alex
>
>>> +#define XIP_FIXUP(addr) ({ \
>>> + uintptr_t __a = (uintptr_t)(addr); \
>>> + (__a >= CONFIG_XIP_PHYS_ADDR && __a < CONFIG_XIP_PHYS_ADDR +
>>> SZ_16M) ? \
>>> + __a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE -
>>> XIP_OFFSET :\
>>> + __a; \
>>> + })
>>> +#else
>>> +#define XIP_FIXUP(addr) (addr)
>>> +#endif /* CONFIG_XIP_KERNEL */
>>> +
>>> #ifdef CONFIG_MMU
>>> /* Number of entries in the page global directory */
>>> #define PTRS_PER_PGD (PAGE_SIZE / sizeof(pgd_t))
>>>
>>
>> Thank you for doing that!
>>
>> Alex
>
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