Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 8b4ae334 authored by James Bottomley's avatar James Bottomley Committed by James Bottomley
Browse files

eliminate special FLUSH flag from page table 



This was used to flush a region even if the page table entry had been
cleared.  In theory this was never necessary, but now we've switched to
alias based flushing, the whole set of code associated with it can be dumped.

Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
parent f311847c

arch/parisc/include/asm/pgtable.h

+4 −10
Original line number Diff line number Diff line
@@ -136,8 +136,7 @@ 
#define _PAGE_NO_CACHE_BIT 24   /* (0x080) Uncached Page (U bit) */

#define _PAGE_ACCESSED_BIT 23   /* (0x100) Software: Page Accessed */

#define _PAGE_PRESENT_BIT  22   /* (0x200) Software: translation valid */

#define _PAGE_FLUSH_BIT    21   /* (0x400) Software: translation valid */

				/*             for cache flushing only */

/* bit 21 was formerly the FLUSH bit but is now unused */

#define _PAGE_USER_BIT     20   /* (0x800) Software: User accessible page */



/* N.B. The bits are defined in terms of a 32 bit word above, so the */
@@ -171,7 +170,6 @@ 
#define _PAGE_NO_CACHE (1 << xlate_pabit(_PAGE_NO_CACHE_BIT))

#define _PAGE_ACCESSED (1 << xlate_pabit(_PAGE_ACCESSED_BIT))

#define _PAGE_PRESENT  (1 << xlate_pabit(_PAGE_PRESENT_BIT))

#define _PAGE_FLUSH    (1 << xlate_pabit(_PAGE_FLUSH_BIT))

#define _PAGE_USER     (1 << xlate_pabit(_PAGE_USER_BIT))

#define _PAGE_FILE     (1 << xlate_pabit(_PAGE_FILE_BIT))
@@ -211,7 +209,6 @@ 
#define PAGE_KERNEL_RO	__pgprot(_PAGE_KERNEL & ~_PAGE_WRITE)

#define PAGE_KERNEL_UNC	__pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)

#define PAGE_GATEWAY    __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_GATEWAY| _PAGE_READ)

#define PAGE_FLUSH      __pgprot(_PAGE_FLUSH)





/*
@@ -259,7 +256,7 @@ extern unsigned long *empty_zero_page; 


#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))



#define pte_none(x)     ((pte_val(x) == 0) || (pte_val(x) & _PAGE_FLUSH))

#define pte_none(x)     (pte_val(x) == 0)

#define pte_present(x)	(pte_val(x) & _PAGE_PRESENT)

#define pte_clear(mm,addr,xp)	do { pte_val(*(xp)) = 0; } while (0)
@@ -442,13 +439,10 @@ struct mm_struct; 
static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)

{

	pte_t old_pte;

	pte_t pte;



	spin_lock(&pa_dbit_lock);

	pte = old_pte = *ptep;

	pte_val(pte) &= ~_PAGE_PRESENT;

	pte_val(pte) |= _PAGE_FLUSH;

	set_pte_at(mm,addr,ptep,pte);

	old_pte = *ptep;

	pte_clear(mm,addr,ptep);

	spin_unlock(&pa_dbit_lock);



	return old_pte;

arch/parisc/kernel/entry.S

+3 −58
Original line number Diff line number Diff line
@@ -1206,23 +1206,7 @@ nadtlb_miss_20w: 
	nop



nadtlb_check_alias_20w:

	do_alias	spc,t0,t1,va,pte,prot,nadtlb_check_flush_20w



	idtlbt          pte,prot



	rfir

	nop



nadtlb_check_flush_20w:

	bb,>=,n          pte,_PAGE_FLUSH_BIT,nadtlb_emulate



	/* Insert a "flush only" translation */



	depdi,z         7,7,3,prot

	depdi           1,10,1,prot



	/* Drop prot bits from pte and convert to page addr for idtlbt */

	convert_for_tlb_insert20 pte

	do_alias	spc,t0,t1,va,pte,prot,nadtlb_emulate



	idtlbt          pte,prot
@@ -1286,7 +1270,7 @@ nadtlb_miss_11: 
	nop



nadtlb_check_alias_11:

	do_alias	spc,t0,t1,va,pte,prot,nadtlb_check_flush_11

	do_alias	spc,t0,t1,va,pte,prot,nadtlb_emulate



	idtlba          pte,(va)

	idtlbp          prot,(va)
@@ -1294,30 +1278,6 @@ nadtlb_check_alias_11: 
	rfir

	nop



nadtlb_check_flush_11:

	bb,>=,n          pte,_PAGE_FLUSH_BIT,nadtlb_emulate



	/* Insert a "flush only" translation */



	zdepi           7,7,3,prot

	depi            1,10,1,prot



	/* Get rid of prot bits and convert to page addr for idtlba */



	depi		0,31,ASM_PFN_PTE_SHIFT,pte

	SHRREG		pte,(ASM_PFN_PTE_SHIFT-(31-26)),pte



	mfsp		%sr1,t0  /* Save sr1 so we can use it in tlb inserts */

	mtsp		spc,%sr1



	idtlba		pte,(%sr1,va)

	idtlbp		prot,(%sr1,va)



	mtsp		t0, %sr1	/* Restore sr1 */



	rfir

	nop



dtlb_miss_20:

	space_adjust	spc,va,t0

	get_pgd		spc,ptp
@@ -1363,28 +1323,13 @@ nadtlb_miss_20: 
	nop



nadtlb_check_alias_20:

	do_alias	spc,t0,t1,va,pte,prot,nadtlb_check_flush_20

	do_alias	spc,t0,t1,va,pte,prot,nadtlb_emulate



	idtlbt          pte,prot



	rfir

	nop



nadtlb_check_flush_20:

	bb,>=,n          pte,_PAGE_FLUSH_BIT,nadtlb_emulate



	/* Insert a "flush only" translation */



	depdi,z         7,7,3,prot

	depdi           1,10,1,prot



	/* Drop prot bits from pte and convert to page addr for idtlbt */

	convert_for_tlb_insert20 pte



	idtlbt          pte,prot



	rfir

	nop

#endif



nadtlb_emulate: