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Diffstat (limited to 'include/asm-powerpc/abs_addr.h')
| -rw-r--r-- | include/asm-powerpc/abs_addr.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/include/asm-powerpc/abs_addr.h b/include/asm-powerpc/abs_addr.h new file mode 100644 index 00000000000..18415108fc5 --- /dev/null +++ b/include/asm-powerpc/abs_addr.h @@ -0,0 +1,73 @@ +#ifndef _ASM_POWERPC_ABS_ADDR_H +#define _ASM_POWERPC_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) + +/* + * Converts Virtual Address to Real Address for + * Legacy iSeries Hypervisor calls + */ +#define iseries_hv_addr(virtaddr) \ + (0x8000000000000000 | virt_to_abs(virtaddr)) + +#endif /* _ASM_POWERPC_ABS_ADDR_H */ |