From d5d14ed6f2db7287a5088e1350cf422bf72140b3 Mon Sep 17 00:00:00 2001 From: Chris Metcalf Date: Thu, 29 Mar 2012 13:58:43 -0400 Subject: arch/tile: Allow tilegx to build with either 16K or 64K page size This change introduces new flags for the hv_install_context() API that passes a page table pointer to the hypervisor. Clients can explicitly request 4K, 16K, or 64K small pages when they install a new context. In practice, the page size is fixed at kernel compile time and the same size is always requested every time a new page table is installed. The header changes so that it provides more abstract macros for managing "page" things like PFNs and page tables. For example there is now a HV_DEFAULT_PAGE_SIZE_SMALL instead of the old HV_PAGE_SIZE_SMALL. The various PFN routines have been eliminated and only PA- or PTFN-based ones remain (since PTFNs are always expressed in fixed 2KB "page" size). The page-table management macros are renamed with a leading underscore and take page-size arguments with the presumption that clients will use those macros in some single place to provide the "real" macros they will use themselves. I happened to notice the old hv_set_caching() API was totally broken (it assumed 4KB pages) so I changed it so it would nominally work correctly with other page sizes. Tag modules with the page size so you can't load a module built with a conflicting page size. (And add a test for SMP while we're at it.) Signed-off-by: Chris Metcalf --- arch/tile/include/asm/mmu_context.h | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'arch/tile/include/asm/mmu_context.h') diff --git a/arch/tile/include/asm/mmu_context.h b/arch/tile/include/asm/mmu_context.h index 15fb24641120..37f0b741dee7 100644 --- a/arch/tile/include/asm/mmu_context.h +++ b/arch/tile/include/asm/mmu_context.h @@ -30,11 +30,15 @@ init_new_context(struct task_struct *tsk, struct mm_struct *mm) return 0; } -/* Note that arch/tile/kernel/head.S also calls hv_install_context() */ +/* + * Note that arch/tile/kernel/head_NN.S and arch/tile/mm/migrate_NN.S + * also call hv_install_context(). + */ static inline void __install_page_table(pgd_t *pgdir, int asid, pgprot_t prot) { /* FIXME: DIRECTIO should not always be set. FIXME. */ - int rc = hv_install_context(__pa(pgdir), prot, asid, HV_CTX_DIRECTIO); + int rc = hv_install_context(__pa(pgdir), prot, asid, + HV_CTX_DIRECTIO | CTX_PAGE_FLAG); if (rc < 0) panic("hv_install_context failed: %d", rc); } -- cgit v1.2.2