bef5686229
We can now remove CONFIG_MSCHUNKS as it doesn't do anything interesting anymore. The only macro in abs_addr.h which is called by non-iSeries code is phys_to_abs(), so remove the other dummy implementations, and we add a firmware feature check to phys_to_abs(). Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
#ifndef _ABS_ADDR_H
|
|
#define _ABS_ADDR_H
|
|
|
|
#include <linux/config.h>
|
|
|
|
/*
|
|
* c 2001 PPC 64 Team, IBM Corp
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <asm/types.h>
|
|
#include <asm/page.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/lmb.h>
|
|
#include <asm/firmware.h>
|
|
|
|
struct mschunks_map {
|
|
unsigned long num_chunks;
|
|
unsigned long chunk_size;
|
|
unsigned long chunk_shift;
|
|
unsigned long chunk_mask;
|
|
u32 *mapping;
|
|
};
|
|
|
|
extern struct mschunks_map mschunks_map;
|
|
|
|
/* Chunks are 256 KB */
|
|
#define MSCHUNKS_CHUNK_SHIFT (18)
|
|
#define MSCHUNKS_CHUNK_SIZE (1UL << MSCHUNKS_CHUNK_SHIFT)
|
|
#define MSCHUNKS_OFFSET_MASK (MSCHUNKS_CHUNK_SIZE - 1)
|
|
|
|
static inline unsigned long chunk_to_addr(unsigned long chunk)
|
|
{
|
|
return chunk << MSCHUNKS_CHUNK_SHIFT;
|
|
}
|
|
|
|
static inline unsigned long addr_to_chunk(unsigned long addr)
|
|
{
|
|
return addr >> MSCHUNKS_CHUNK_SHIFT;
|
|
}
|
|
|
|
static inline unsigned long phys_to_abs(unsigned long pa)
|
|
{
|
|
unsigned long chunk;
|
|
|
|
/* This is a no-op on non-iSeries */
|
|
if (!firmware_has_feature(FW_FEATURE_ISERIES))
|
|
return pa;
|
|
|
|
chunk = addr_to_chunk(pa);
|
|
|
|
if (chunk < mschunks_map.num_chunks)
|
|
chunk = mschunks_map.mapping[chunk];
|
|
|
|
return chunk_to_addr(chunk) + (pa & MSCHUNKS_OFFSET_MASK);
|
|
}
|
|
|
|
/* Convenience macros */
|
|
#define virt_to_abs(va) phys_to_abs(__pa(va))
|
|
#define abs_to_virt(aa) __va(aa)
|
|
|
|
#endif /* _ABS_ADDR_H */
|