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s390/boot: pin amode31 default lma

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The special amode31 part of the kernel must always remain below 2Gb. Place
it just under vmlinux.default_lma by default, which makes it easier to
debug amode31 as its default lma is known 0x10000 - 0x3000 (currently,
amode31's size is 3 pages). This location is always available as it is
originally occupied by the vmlinux archive.

Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Vasily Gorbik 2023-03-15 11:00:19 +01:00
parent a1d2d9cbaf
commit 898435203c
1 changed files with 3 additions and 1 deletions
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arch/s390/boot/startup.c
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@ -278,6 +278,7 @@ void startup_kernel(void)
{
unsigned long max_physmem_end;
unsigned long vmlinux_lma = 0;
unsigned long amode31_lma;
unsigned long asce_limit;
unsigned long safe_addr;
void *img;
@ -335,7 +336,8 @@ void startup_kernel(void)
/* vmlinux decompression is done, shrink reserved low memory */
physmem_reserve(RR_DECOMPRESSOR, 0, (unsigned long)_decompressor_end);
physmem_alloc_range(RR_AMODE31, vmlinux.amode31_size, PAGE_SIZE, 0, SZ_2G, true);
amode31_lma = vmlinux.default_lma - vmlinux.amode31_size;
physmem_reserve(RR_AMODE31, amode31_lma, vmlinux.amode31_size);
/*
* The order of the following operations is important: