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Finishes basic paging support

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2876 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2010-08-21 22:27:42 +00:00
parent 11dc28963d
commit 944e132e95
2 changed files with 71 additions and 1 deletions
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6
arch/arm/src/arm/pg_macros.h
View File

@ -91,6 +91,9 @@
# define MMU_L1_PGTABFLAGS (PMD_TYPE_FINE|PMD_BIT4)
# define MMU_L2_PGTABFLAGS (PTE_TYPE_TINY|PTE_EXT_AP_UNO_SRW)
# define MMU_L2_VECTRWFLAGS (PTE_TYPE_TINY|PTE_EXT_AP_UNO_SRW)
# define MMU_L2_VECTROFLAGS (PTE_TYPE_TINY|PTE_EXT_AP_UNO_SRO|PTE_CACHEABLE)
#elif CONFIG_PAGING_PAGESIZE == 4096
/* Number of pages in an L2 table per L1 entry */
@ -115,6 +118,9 @@
# define MMU_L1_PGTABFLAGS (PMD_TYPE_COARSE|PMD_BIT4)
# define MMU_L2_PGTABFLAGS (PTE_TYPE_SMALL|PTE_SMALL_AP_UNO_SRW)
# define MMU_L2_VECTRWFLAGS (PTE_TYPE_SMALL|PTE_SMALL_AP_UNO_SRW)
# define MMU_L2_VECTROFLAGS (PTE_TYPE_SMALL|PTE_SMALL_AP_UNO_SRO|PTE_CACHEABLE)
#else
# error "Need extended definitions for CONFIG_PAGING_PAGESIZE"
#endif

66
arch/arm/src/lpc313x/lpc313x_boot.c
View File

@ -192,6 +192,56 @@ static void up_setupmappings(void)
}
#endif
/************************************************************************************
* Name: up_vectorpermissions
*
* Description:
* Set permissions on the vector mapping.
*
************************************************************************************/
#if !defined(CONFIG_ARCH_ROMPGTABLE) && defined(CONFIG_ARCH_LOWVECTORS) && defined(CONFIG_PAGING)
static void up_vectorpermissions(uint32 mmuflags)
{
uint32_t *ptr = (uint3t*)PG_L2_VECT_VADDR;
uint32_t pte;
/* This is easily because we have already been told everything! */
pte = *ptr;
#ifdef CONFIG_PAGING_VECPPAGE
/* We've been told to use a specify page for the vectors. In this
* case, I expect the pte to be zero the first time this function is
* called (what if it is not?)
*/
if (pte == 0)
{
pte = PG_VECT_PBASE;
}
else
{
pte &= PG_L1_PADDRMASK;
}
#else
/* Otherwise, we should be using the page at the beginning of the
* locked text region.
*/
ASSERT(pte != 0);
pte &= PG_L1_PADDRMASK;
#endif
/* Update the MMU flags and save */
*ptr = pte | mmuflags;
/* Invalid the TLB for this address */
tlb_invalidate_single(PG_L2_VECT_VADDR);
}
#endif
/************************************************************************************
* Name: up_vectormapping
*
@ -288,6 +338,14 @@ void up_boot(void)
#ifndef CONFIG_ARCH_ROMPGTABLE
up_setupmappings();
/* If we are using vectors in low memory but RAM in that area has been marked
* read only, then temparily mark the mapping write-able (non-buffered).
*/
#if defined(CONFIG_ARCH_LOWVECTORS) && defined(CONFIG_PAGING)
up_vectorpermissions(MMU_L2_VECTRWFLAGS);
#endif
/* Provide a special mapping for the IRAM interrupt vector positioned in high
* memory.
*/
@ -295,7 +353,7 @@ void up_boot(void)
#ifndef CONFIG_ARCH_LOWVECTORS
up_vectormapping();
#endif
#endif
#endif /* CONFIG_ARCH_ROMPGTABLE */
/* Setup up vector block. _vector_start and _vector_end are exported from
* up_vector.S
@ -303,6 +361,12 @@ void up_boot(void)
up_copyvectorblock();
/* Make the vectors read-only, cacheable again */
#if !defined(CONFIG_ARCH_ROMPGTABLE) && defined(CONFIG_ARCH_LOWVECTORS) && defined(CONFIG_PAGING)
up_vectorpermissions(MMU_L2_VECTROFLAGS);
#endif
/* Reset all clocks */
lpc313x_resetclks();