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Subject[PATCH 30/33] x86_64: Remove CONFIG_PHYSICAL_START
Date
I am about to add relocatable kernel support which has essentially
no cost so there is no point in retaining CONFIG_PHYSICAL_START
and retaining CONFIG_PHYSICAL_START makes implementation of and
testing of a relocatable kernel more difficult.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
arch/x86_64/Kconfig | 19 -------------------
arch/x86_64/boot/compressed/head.S | 6 +++---
arch/x86_64/boot/compressed/misc.c | 6 +++---
arch/x86_64/defconfig | 1 -
arch/x86_64/kernel/vmlinux.lds.S | 2 +-
arch/x86_64/mm/fault.c | 4 ++--
include/asm-x86_64/page.h | 2 --
7 files changed, 9 insertions(+), 31 deletions(-)
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 28df7d8..763b25b 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -486,25 +486,6 @@ config CRASH_DUMP
help
Generate crash dump after being started by kexec.

-config PHYSICAL_START
- hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
- default "0x1000000" if CRASH_DUMP
- default "0x200000"
- help
- This gives the physical address where the kernel is loaded. Normally
- for regular kernels this value is 0x200000 (2MB). But in the case
- of kexec on panic the fail safe kernel needs to run at a different
- address than the panic-ed kernel. This option is used to set the load
- address for kernels used to capture crash dump on being kexec'ed
- after panic. The default value for crash dump kernels is
- 0x1000000 (16MB). This can also be set based on the "X" value as
- specified in the "crashkernel=YM@XM" command line boot parameter
- passed to the panic-ed kernel. Typically this parameter is set as
- crashkernel=64M@16M. Please take a look at
- Documentation/kdump/kdump.txt for more details about crash dumps.
-
- Don't change this unless you know what you are doing.
-
config SECCOMP
bool "Enable seccomp to safely compute untrusted bytecode"
depends on PROC_FS
diff --git a/arch/x86_64/boot/compressed/head.S b/arch/x86_64/boot/compressed/head.S
index 6f55565..cf55d09 100644
--- a/arch/x86_64/boot/compressed/head.S
+++ b/arch/x86_64/boot/compressed/head.S
@@ -76,7 +76,7 @@ startup_32:
jnz 3f
addl $8,%esp
xorl %ebx,%ebx
- ljmp $(__KERNEL_CS), $__PHYSICAL_START
+ ljmp $(__KERNEL_CS), $0x200000

/*
* We come here, if we were loaded high.
@@ -102,7 +102,7 @@ startup_32:
popl %ecx # lcount
popl %edx # high_buffer_start
popl %eax # hcount
- movl $__PHYSICAL_START,%edi
+ movl $0x200000,%edi
cli # make sure we don't get interrupted
ljmp $(__KERNEL_CS), $0x1000 # and jump to the move routine

@@ -127,7 +127,7 @@ move_routine_start:
movsl
movl %ebx,%esi # Restore setup pointer
xorl %ebx,%ebx
- ljmp $(__KERNEL_CS), $__PHYSICAL_START
+ ljmp $(__KERNEL_CS), $0x200000
move_routine_end:


diff --git a/arch/x86_64/boot/compressed/misc.c b/arch/x86_64/boot/compressed/misc.c
index 3755b2e..259bb05 100644
--- a/arch/x86_64/boot/compressed/misc.c
+++ b/arch/x86_64/boot/compressed/misc.c
@@ -288,7 +288,7 @@ #ifdef STANDARD_MEMORY_BIOS_CALL
#else
if ((RM_ALT_MEM_K > RM_EXT_MEM_K ? RM_ALT_MEM_K : RM_EXT_MEM_K) < 1024) error("Less than 2MB of memory");
#endif
- output_data = (unsigned char *)__PHYSICAL_START; /* Normally Points to 1M */
+ output_data = (unsigned char *)0x200000;
free_mem_end_ptr = (long)real_mode;
}

@@ -311,8 +311,8 @@ #endif
low_buffer_size = low_buffer_end - LOW_BUFFER_START;
high_loaded = 1;
free_mem_end_ptr = (long)high_buffer_start;
- if ( (__PHYSICAL_START + low_buffer_size) > ((ulg)high_buffer_start)) {
- high_buffer_start = (uch *)(__PHYSICAL_START + low_buffer_size);
+ if ( (0x200000 + low_buffer_size) > ((ulg)high_buffer_start)) {
+ high_buffer_start = (uch *)(0x200000 + low_buffer_size);
mv->hcount = 0; /* say: we need not to move high_buffer */
}
else mv->hcount = -1;
diff --git a/arch/x86_64/defconfig b/arch/x86_64/defconfig
index 840d5d9..06cf378 100644
--- a/arch/x86_64/defconfig
+++ b/arch/x86_64/defconfig
@@ -158,7 +158,6 @@ CONFIG_X86_MCE_INTEL=y
CONFIG_X86_MCE_AMD=y
# CONFIG_KEXEC is not set
# CONFIG_CRASH_DUMP is not set
-CONFIG_PHYSICAL_START=0x200000
CONFIG_SECCOMP=y
# CONFIG_HZ_100 is not set
CONFIG_HZ_250=y
diff --git a/arch/x86_64/kernel/vmlinux.lds.S b/arch/x86_64/kernel/vmlinux.lds.S
index 7c4de31..741487b 100644
--- a/arch/x86_64/kernel/vmlinux.lds.S
+++ b/arch/x86_64/kernel/vmlinux.lds.S
@@ -15,7 +15,7 @@ ENTRY(phys_startup_64)
jiffies_64 = jiffies;
SECTIONS
{
- . = __START_KERNEL;
+ . = __START_KERNEL_map + 0x200000;
phys_startup_64 = startup_64 - LOAD_OFFSET;
_text = .; /* Text and read-only data */
.text : AT(ADDR(.text) - LOAD_OFFSET) {
diff --git a/arch/x86_64/mm/fault.c b/arch/x86_64/mm/fault.c
index ac8ea66..26d315b 100644
--- a/arch/x86_64/mm/fault.c
+++ b/arch/x86_64/mm/fault.c
@@ -650,9 +650,9 @@ void vmalloc_sync_all(void)
start = address + PGDIR_SIZE;
}
/* Check that there is no need to do the same for the modules area. */
- BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL));
+ BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL_map));
BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) ==
- (__START_KERNEL & PGDIR_MASK)));
+ (__START_KERNEL_map & PGDIR_MASK)));
}

static int __init enable_pagefaulttrace(char *str)
diff --git a/include/asm-x86_64/page.h b/include/asm-x86_64/page.h
index 37f95ca..deed41a 100644
--- a/include/asm-x86_64/page.h
+++ b/include/asm-x86_64/page.h
@@ -75,8 +75,6 @@ #define __pgprot(x) ((pgprot_t) { (x) }

#endif /* !__ASSEMBLY__ */

-#define __PHYSICAL_START _AC(CONFIG_PHYSICAL_START,UL)
-#define __START_KERNEL (__START_KERNEL_map + __PHYSICAL_START)
#define __START_KERNEL_map _AC(0xffffffff80000000,UL)
#define __PAGE_OFFSET _AC(0xffff810000000000,UL)

--
1.4.2.rc2.g5209e
-
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