SPARC: Added generic support for SPARC architecture.

Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>

1 files changed, 301 insertions, 0 deletions

diff --git a/include/asm-sparc/srmmu.h b/include/asm-sparc/srmmu.h
new file mode 100644
index 0000000..5214d96
--- /dev/null
+++ b/include/asm-sparc/srmmu.h
@@ -0,0 +1,301 @@
+/* SRMMU page table defines and code,
+ * taken from the SPARC port of Linux
+ *
+ * Copyright (C) 2007 Daniel Hellstrom (daniel@gaisler.com)
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#ifndef __SPARC_SRMMU_H__
+#define __SPARC_SRMMU_H__
+
+#include <asm/asi.h>
+#include <asm/page.h>
+
+/* Number of contexts is implementation-dependent; 64k is the most we support */
+#define SRMMU_MAX_CONTEXTS	65536
+
+/* PMD_SHIFT determines the size of the area a second-level page table entry can map */
+#define SRMMU_REAL_PMD_SHIFT		18
+#define SRMMU_REAL_PMD_SIZE		(1UL << SRMMU_REAL_PMD_SHIFT)
+#define SRMMU_REAL_PMD_MASK		(~(SRMMU_REAL_PMD_SIZE-1))
+#define SRMMU_REAL_PMD_ALIGN(__addr)	(((__addr)+SRMMU_REAL_PMD_SIZE-1)&SRMMU_REAL_PMD_MASK)
+
+/* PGDIR_SHIFT determines what a third-level page table entry can map */
+#define SRMMU_PGDIR_SHIFT       24
+#define SRMMU_PGDIR_SIZE        (1UL << SRMMU_PGDIR_SHIFT)
+#define SRMMU_PGDIR_MASK        (~(SRMMU_PGDIR_SIZE-1))
+#define SRMMU_PGDIR_ALIGN(addr) (((addr)+SRMMU_PGDIR_SIZE-1)&SRMMU_PGDIR_MASK)
+
+#define SRMMU_REAL_PTRS_PER_PTE	64
+#define SRMMU_REAL_PTRS_PER_PMD	64
+#define SRMMU_PTRS_PER_PGD	256
+
+#define SRMMU_REAL_PTE_TABLE_SIZE	(SRMMU_REAL_PTRS_PER_PTE*4)
+#define SRMMU_PMD_TABLE_SIZE		(SRMMU_REAL_PTRS_PER_PMD*4)
+#define SRMMU_PGD_TABLE_SIZE		(SRMMU_PTRS_PER_PGD*4)
+
+/*
+ * To support pagetables in highmem, Linux introduces APIs which
+ * return struct page* and generally manipulate page tables when
+ * they are not mapped into kernel space. Our hardware page tables
+ * are smaller than pages. We lump hardware tabes into big, page sized
+ * software tables.
+ *
+ * PMD_SHIFT determines the size of the area a second-level page table entry
+ * can map, and our pmd_t is 16 times larger than normal.  The values which
+ * were once defined here are now generic for 4c and srmmu, so they're
+ * found in pgtable.h.
+ */
+#define SRMMU_PTRS_PER_PMD	4
+
+/* Definition of the values in the ET field of PTD's and PTE's */
+#define SRMMU_ET_MASK         0x3
+#define SRMMU_ET_INVALID      0x0
+#define SRMMU_ET_PTD          0x1
+#define SRMMU_ET_PTE          0x2
+#define SRMMU_ET_REPTE        0x3	/* AIEEE, SuperSparc II reverse endian page! */
+
+/* Physical page extraction from PTP's and PTE's. */
+#define SRMMU_CTX_PMASK    0xfffffff0
+#define SRMMU_PTD_PMASK    0xfffffff0
+#define SRMMU_PTE_PMASK    0xffffff00
+
+/* The pte non-page bits.  Some notes:
+ * 1) cache, dirty, valid, and ref are frobbable
+ *    for both supervisor and user pages.
+ * 2) exec and write will only give the desired effect
+ *    on user pages
+ * 3) use priv and priv_readonly for changing the
+ *    characteristics of supervisor ptes
+ */
+#define SRMMU_CACHE        0x80
+#define SRMMU_DIRTY        0x40
+#define SRMMU_REF          0x20
+#define SRMMU_NOREAD       0x10
+#define SRMMU_EXEC         0x08
+#define SRMMU_WRITE        0x04
+#define SRMMU_VALID        0x02	/* SRMMU_ET_PTE */
+#define SRMMU_PRIV         0x1c
+#define SRMMU_PRIV_RDONLY  0x18
+
+#define SRMMU_FILE         0x40	/* Implemented in software */
+
+#define SRMMU_PTE_FILE_SHIFT     8	/* == 32-PTE_FILE_MAX_BITS */
+
+#define SRMMU_CHG_MASK    (0xffffff00 | SRMMU_REF | SRMMU_DIRTY)
+
+/* SRMMU swap entry encoding
+ *
+ * We use 5 bits for the type and 19 for the offset.  This gives us
+ * 32 swapfiles of 4GB each.  Encoding looks like:
+ *
+ * oooooooooooooooooootttttRRRRRRRR
+ * fedcba9876543210fedcba9876543210
+ *
+ * The bottom 8 bits are reserved for protection and status bits, especially
+ * FILE and PRESENT.
+ */
+#define SRMMU_SWP_TYPE_MASK	0x1f
+#define SRMMU_SWP_TYPE_SHIFT	SRMMU_PTE_FILE_SHIFT
+#define SRMMU_SWP_OFF_MASK	0x7ffff
+#define SRMMU_SWP_OFF_SHIFT	(SRMMU_PTE_FILE_SHIFT + 5)
+
+/* Some day I will implement true fine grained access bits for
+ * user pages because the SRMMU gives us the capabilities to
+ * enforce all the protection levels that vma's can have.
+ * XXX But for now...
+ */
+#define SRMMU_PAGE_NONE    __pgprot(SRMMU_CACHE | \
+				    SRMMU_PRIV | SRMMU_REF)
+#define SRMMU_PAGE_SHARED  __pgprot(SRMMU_VALID | SRMMU_CACHE | \
+				    SRMMU_EXEC | SRMMU_WRITE | SRMMU_REF)
+#define SRMMU_PAGE_COPY    __pgprot(SRMMU_VALID | SRMMU_CACHE | \
+				    SRMMU_EXEC | SRMMU_REF)
+#define SRMMU_PAGE_RDONLY  __pgprot(SRMMU_VALID | SRMMU_CACHE | \
+				    SRMMU_EXEC | SRMMU_REF)
+#define SRMMU_PAGE_KERNEL  __pgprot(SRMMU_VALID | SRMMU_CACHE | SRMMU_PRIV | \
+				    SRMMU_DIRTY | SRMMU_REF)
+
+/* SRMMU Register addresses in ASI 0x4.  These are valid for all
+ * current SRMMU implementations that exist.
+ */
+#define SRMMU_CTRL_REG           0x00000000
+#define SRMMU_CTXTBL_PTR         0x00000100
+#define SRMMU_CTX_REG            0x00000200
+#define SRMMU_FAULT_STATUS       0x00000300
+#define SRMMU_FAULT_ADDR         0x00000400
+
+#define WINDOW_FLUSH(tmp1, tmp2)					\
+	mov	0, tmp1;						\
+98:	ld	[%g6 + TI_UWINMASK], tmp2;				\
+	orcc	%g0, tmp2, %g0;						\
+	add	tmp1, 1, tmp1;						\
+	bne	98b;							\
+	 save	%sp, -64, %sp;						\
+99:	subcc	tmp1, 1, tmp1;						\
+	bne	99b;							\
+	 restore %g0, %g0, %g0;
+
+#ifndef __ASSEMBLY__
+
+/* This makes sense. Honest it does - Anton */
+/* XXX Yes but it's ugly as sin.  FIXME. -KMW */
+extern void *srmmu_nocache_pool;
+#define __nocache_pa(VADDR) (((unsigned long)VADDR) - SRMMU_NOCACHE_VADDR + __pa((unsigned long)srmmu_nocache_pool))
+#define __nocache_va(PADDR) (__va((unsigned long)PADDR) - (unsigned long)srmmu_nocache_pool + SRMMU_NOCACHE_VADDR)
+#define __nocache_fix(VADDR) __va(__nocache_pa(VADDR))
+
+/* Accessing the MMU control register. */
+extern __inline__ unsigned int srmmu_get_mmureg(void)
+{
+	unsigned int retval;
+	__asm__ __volatile__("lda [%%g0] %1, %0\n\t":
+			     "=r"(retval):"i"(ASI_M_MMUREGS));
+	return retval;
+}
+
+extern __inline__ void srmmu_set_mmureg(unsigned long regval)
+{
+	__asm__ __volatile__("sta %0, [%%g0] %1\n\t"::"r"(regval),
+			     "i"(ASI_M_MMUREGS):"memory");
+
+}
+
+extern __inline__ void srmmu_set_ctable_ptr(unsigned long paddr)
+{
+	paddr = ((paddr >> 4) & SRMMU_CTX_PMASK);
+	__asm__ __volatile__("sta %0, [%1] %2\n\t"::"r"(paddr),
+			     "r"(SRMMU_CTXTBL_PTR),
+			     "i"(ASI_M_MMUREGS):"memory");
+}
+
+extern __inline__ unsigned long srmmu_get_ctable_ptr(void)
+{
+	unsigned int retval;
+
+	__asm__ __volatile__("lda [%1] %2, %0\n\t":
+			     "=r"(retval):
+			     "r"(SRMMU_CTXTBL_PTR), "i"(ASI_M_MMUREGS));
+	return (retval & SRMMU_CTX_PMASK) << 4;
+}
+
+extern __inline__ void srmmu_set_context(int context)
+{
+	__asm__ __volatile__("sta %0, [%1] %2\n\t"::"r"(context),
+			     "r"(SRMMU_CTX_REG), "i"(ASI_M_MMUREGS):"memory");
+}
+
+extern __inline__ int srmmu_get_context(void)
+{
+	register int retval;
+	__asm__ __volatile__("lda [%1] %2, %0\n\t":
+			     "=r"(retval):
+			     "r"(SRMMU_CTX_REG), "i"(ASI_M_MMUREGS));
+	return retval;
+}
+
+extern __inline__ unsigned int srmmu_get_fstatus(void)
+{
+	unsigned int retval;
+
+	__asm__ __volatile__("lda [%1] %2, %0\n\t":
+			     "=r"(retval):
+			     "r"(SRMMU_FAULT_STATUS), "i"(ASI_M_MMUREGS));
+	return retval;
+}
+
+extern __inline__ unsigned int srmmu_get_faddr(void)
+{
+	unsigned int retval;
+
+	__asm__ __volatile__("lda [%1] %2, %0\n\t":
+			     "=r"(retval):
+			     "r"(SRMMU_FAULT_ADDR), "i"(ASI_M_MMUREGS));
+	return retval;
+}
+
+/* This is guaranteed on all SRMMU's. */
+extern __inline__ void srmmu_flush_whole_tlb(void)
+{
+	__asm__ __volatile__("sta %%g0, [%0] %1\n\t"::"r"(0x400),	/* Flush entire TLB!! */
+			     "i"(ASI_M_FLUSH_PROBE):"memory");
+
+}
+
+/* These flush types are not available on all chips... */
+extern __inline__ void srmmu_flush_tlb_ctx(void)
+{
+	__asm__ __volatile__("sta %%g0, [%0] %1\n\t"::"r"(0x300),	/* Flush TLB ctx.. */
+			     "i"(ASI_M_FLUSH_PROBE):"memory");
+
+}
+
+extern __inline__ void srmmu_flush_tlb_region(unsigned long addr)
+{
+	addr &= SRMMU_PGDIR_MASK;
+	__asm__ __volatile__("sta %%g0, [%0] %1\n\t"::"r"(addr | 0x200),	/* Flush TLB region.. */
+			     "i"(ASI_M_FLUSH_PROBE):"memory");
+
+}
+
+extern __inline__ void srmmu_flush_tlb_segment(unsigned long addr)
+{
+	addr &= SRMMU_REAL_PMD_MASK;
+	__asm__ __volatile__("sta %%g0, [%0] %1\n\t"::"r"(addr | 0x100),	/* Flush TLB segment.. */
+			     "i"(ASI_M_FLUSH_PROBE):"memory");
+
+}
+
+extern __inline__ void srmmu_flush_tlb_page(unsigned long page)
+{
+	page &= PAGE_MASK;
+	__asm__ __volatile__("sta %%g0, [%0] %1\n\t"::"r"(page),	/* Flush TLB page.. */
+			     "i"(ASI_M_FLUSH_PROBE):"memory");
+
+}
+
+extern __inline__ unsigned long srmmu_hwprobe(unsigned long vaddr)
+{
+	unsigned long retval;
+
+	vaddr &= PAGE_MASK;
+	__asm__ __volatile__("lda [%1] %2, %0\n\t":
+			     "=r"(retval):
+			     "r"(vaddr | 0x400), "i"(ASI_M_FLUSH_PROBE));
+
+	return retval;
+}
+
+extern __inline__ int srmmu_get_pte(unsigned long addr)
+{
+	register unsigned long entry;
+
+	__asm__ __volatile__("\n\tlda [%1] %2,%0\n\t":
+			     "=r"(entry):
+			     "r"((addr & 0xfffff000) | 0x400),
+			     "i"(ASI_M_FLUSH_PROBE));
+	return entry;
+}
+
+extern unsigned long (*srmmu_read_physical) (unsigned long paddr);
+extern void (*srmmu_write_physical) (unsigned long paddr, unsigned long word);
+
+#endif				/* !(__ASSEMBLY__) */
+
+#endif				/* !(__SPARC_SRMMU_H__) */