19f9a34f87
This implements initial support for the vsyscall page on SH. At the moment we leave it configurable due to having nommu to support from the same code base. We hook it up for the signal trampoline return at present, with more to be added later, once uClibc catches up. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
#ifndef __MMU_H
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#define __MMU_H
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#if !defined(CONFIG_MMU)
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typedef struct {
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struct vm_list_struct *vmlist;
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unsigned long end_brk;
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} mm_context_t;
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#else
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/* Default "unsigned long" context */
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typedef unsigned long mm_context_id_t;
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typedef struct {
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mm_context_id_t id;
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void *vdso;
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} mm_context_t;
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#endif /* CONFIG_MMU */
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/*
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* Privileged Space Mapping Buffer (PMB) definitions
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*/
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#define PMB_PASCR 0xff000070
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#define PMB_IRMCR 0xff000078
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#define PMB_ADDR 0xf6100000
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#define PMB_DATA 0xf7100000
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#define PMB_ENTRY_MAX 16
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#define PMB_E_MASK 0x0000000f
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#define PMB_E_SHIFT 8
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#define PMB_SZ_16M 0x00000000
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#define PMB_SZ_64M 0x00000010
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#define PMB_SZ_128M 0x00000080
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#define PMB_SZ_512M 0x00000090
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#define PMB_SZ_MASK PMB_SZ_512M
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#define PMB_C 0x00000008
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#define PMB_WT 0x00000001
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#define PMB_UB 0x00000200
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#define PMB_V 0x00000100
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#define PMB_NO_ENTRY (-1)
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struct pmb_entry;
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struct pmb_entry {
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unsigned long vpn;
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unsigned long ppn;
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unsigned long flags;
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/*
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* 0 .. NR_PMB_ENTRIES for specific entry selection, or
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* PMB_NO_ENTRY to search for a free one
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*/
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int entry;
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struct pmb_entry *next;
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/* Adjacent entry link for contiguous multi-entry mappings */
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struct pmb_entry *link;
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};
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/* arch/sh/mm/pmb.c */
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int __set_pmb_entry(unsigned long vpn, unsigned long ppn,
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unsigned long flags, int *entry);
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int set_pmb_entry(struct pmb_entry *pmbe);
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void clear_pmb_entry(struct pmb_entry *pmbe);
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struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
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unsigned long flags);
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void pmb_free(struct pmb_entry *pmbe);
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long pmb_remap(unsigned long virt, unsigned long phys,
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unsigned long size, unsigned long flags);
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void pmb_unmap(unsigned long addr);
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#endif /* __MMU_H */
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