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m68k/atari - stram: alloc ST-RAM pool even if kernel not in ST-RAM

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With the kernel loaded to FastRAM (TT-RAM), none of the ST-RAM
address range is mapped by init_mem, and ST-RAM is not accessible
through the normal allocation pathways as a result.

Implement ST-RAM pool allocation to be based on physical addresses
always (it already was when the kernel was loaded in ST-RAM).
Return kernel virtual addresses as per normal.

The current test for the kernel residing in ST-RAM always returns
true. Use the bootinfo memory chunk order instead - with the kernel
in FastRAM, ST-RAM (phys. 0x0) is not the first chunk.

In case the kernel is running from FastRAM, delay mapping of ST-RAM
pool until after mem_init.

Provide helper functions for those users of ST-RAM that need
to be aware of the backing physical addresses.

Kudos to Geert for his hints on getting this started.

Signed-off-by: Michael Schmitz <schmitz@debian.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Michael Schmitz
2014-03-31 21:06:05 +13:00
committed by Geert Uytterhoeven
parent c7208164e6
commit fded332bf4
2 changed files with 58 additions and 19 deletions
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2
arch/m68k/include/asm/atari_stram.h
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@@ -8,6 +8,8 @@
/* public interface */
void *atari_stram_alloc(unsigned long size, const char *owner);
void atari_stram_free(void *);
void *atari_stram_to_virt(unsigned long phys);
unsigned long atari_stram_to_phys(void *);
/* functions called internally by other parts of the kernel */
void atari_stram_init(void);