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s390/decompressor: trim the kernel image up to 1M

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Move head64.S main kernel entry point "startup_continue" to 0x100000 and
trim everything which is below 1M during build. So, that the decompressor
would unpack the main kernel image, move it to 0x100000 and jump to
startup_continue.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Vasily Gorbik
2018-06-12 15:11:40 +02:00
committed by Martin Schwidefsky
parent 00f2fb573f
commit bd79d66329
3 changed files with 5 additions and 5 deletions
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6
arch/s390/boot/compressed/head.S
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@@ -23,7 +23,7 @@ ENTRY(startup_continue)
aghi %r15,-160
brasl %r14,decompress_kernel
# Set up registers for memory mover. We move the decompressed image to
# 0x11000, where startup_continue of the decompressed image is supposed
# 0x100000, where startup_continue of the decompressed image is supposed
# to be.
lgr %r4,%r2
lg %r2,.Loffset-.LPG1(%r13)
@@ -33,7 +33,7 @@ ENTRY(startup_continue)
la %r1,0x200
mvc 0(mover_end-mover,%r1),mover-.LPG1(%r13)
# When the memory mover is done we pass control to
# arch/s390/kernel/head64.S:startup_continue which lives at 0x11000 in
# arch/s390/kernel/head64.S:startup_continue which lives at 0x100000 in
# the decompressed image.
lgr %r6,%r2
br %r1
@@ -47,6 +47,6 @@ mover_end:
.Lstack:
.quad 0x8000 + (1<<(PAGE_SHIFT+THREAD_SIZE_ORDER))
.Loffset:
.quad 0x11000
.quad 0x100000
.Lmvsize:
.quad SZ__bss_start