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s390/dump: streamline oldmem copy functions

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Introduce two copy functions for the memory of the dumped system,
copy_oldmem_kernel() to copy to the virtual kernel address space
and copy_oldmem_user() to copy to user space.

Acked-by: Michael Holzheu <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
This commit is contained in:
Martin Schwidefsky 2015-10-12 10:43:37 +02:00
commit df9694c797
6 changed files with 105 additions and 102 deletions
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20
drivers/s390/char/zcore.c
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@ -64,7 +64,7 @@ static struct ipl_parameter_block *ipl_block;
* @count: Size of buffer, which should be copied
* @mode: Either TO_KERNEL or TO_USER
*/
int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode)
static int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode)
{
int offs, blk_num;
static char buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
@ -126,12 +126,26 @@ out:
return 0;
}
static int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count)
/*
* Copy memory from HSA to user memory (not reentrant):
*
* @dest: Kernel or user buffer where memory should be copied to
* @src: Start address within HSA where data should be copied
* @count: Size of buffer, which should be copied
*/
int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count)
{
return memcpy_hsa((void __force *) dest, src, count, TO_USER);
}
static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
/*
* Copy memory from HSA to kernel memory (not reentrant):
*
* @dest: Kernel or user buffer where memory should be copied to
* @src: Start address within HSA where data should be copied
* @count: Size of buffer, which should be copied
*/
int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count)
{
return memcpy_hsa(dest, src, count, TO_KERNEL);
}