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Commit 41b85a11 authored by Helge Deller's avatar Helge Deller
Browse files

parisc: Map kernel text and data on huge pages 



Adjust the linker script and map_pages() to map kernel text and data on
physical 1MB huge/large pages.

Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent 736d2169

arch/parisc/kernel/asm-offsets.c

+8 −0
Original line number Diff line number Diff line
@@ -289,6 +289,14 @@ int main(void) 
	DEFINE(ASM_PTE_ENTRY_SIZE, PTE_ENTRY_SIZE);

	DEFINE(ASM_PFN_PTE_SHIFT, PFN_PTE_SHIFT);

	DEFINE(ASM_PT_INITIAL, PT_INITIAL);

	BLANK();

	/* HUGEPAGE_SIZE is only used in vmlinux.lds.S to align kernel text

	 * and kernel data on physical huge pages */

#ifdef CONFIG_HUGETLB_PAGE

	DEFINE(HUGEPAGE_SIZE, 1UL << REAL_HPAGE_SHIFT);

#else

	DEFINE(HUGEPAGE_SIZE, PAGE_SIZE);

#endif

	BLANK();

	DEFINE(EXCDATA_IP, offsetof(struct exception_data, fault_ip));

	DEFINE(EXCDATA_SPACE, offsetof(struct exception_data, fault_space));

arch/parisc/kernel/vmlinux.lds.S

+6 −3
Original line number Diff line number Diff line
@@ -60,7 +60,7 @@ SECTIONS 
		EXIT_DATA

	}

	PERCPU_SECTION(8)

	. = ALIGN(PAGE_SIZE);

	. = ALIGN(HUGEPAGE_SIZE);

	__init_end = .;

	/* freed after init ends here */
@@ -116,7 +116,7 @@ SECTIONS 
	 * that we can properly leave these

	 * as writable

	 */

	. = ALIGN(PAGE_SIZE);

	. = ALIGN(HUGEPAGE_SIZE);

	data_start = .;



	EXCEPTION_TABLE(8)
@@ -135,8 +135,11 @@ SECTIONS 
	_edata = .;



	/* BSS */

	BSS_SECTION(PAGE_SIZE, PAGE_SIZE, 8)

	BSS_SECTION(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE)



	/* bootmap is allocated in setup_bootmem() directly behind bss. */



	. = ALIGN(HUGEPAGE_SIZE);

	_end = . ;



	STABS_DEBUG

arch/parisc/mm/init.c

+17 −23
Original line number Diff line number Diff line
@@ -407,15 +407,11 @@ static void __init map_pages(unsigned long start_vaddr, 
	unsigned long vaddr;

	unsigned long ro_start;

	unsigned long ro_end;

	unsigned long fv_addr;

	unsigned long gw_addr;

	extern const unsigned long fault_vector_20;

	extern void * const linux_gateway_page;

	unsigned long kernel_end;



	ro_start = __pa((unsigned long)_text);

	ro_end   = __pa((unsigned long)&data_start);

	fv_addr  = __pa((unsigned long)&fault_vector_20) & PAGE_MASK;

	gw_addr  = __pa((unsigned long)&linux_gateway_page) & PAGE_MASK;

	kernel_end  = __pa((unsigned long)&_end);



	end_paddr = start_paddr + size;
@@ -473,24 +469,25 @@ static void __init map_pages(unsigned long start_vaddr, 
			for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) {

				pte_t pte;



				/*

				 * Map the fault vector writable so we can

				 * write the HPMC checksum.

				 */

				if (force)

					pte =  __mk_pte(address, pgprot);

				else if (parisc_text_address(vaddr) &&

					 address != fv_addr)

				else if (parisc_text_address(vaddr)) {

					pte = __mk_pte(address, PAGE_KERNEL_EXEC);

					if (address >= ro_start && address < kernel_end)

						pte = pte_mkhuge(pte);

				}

				else

#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)

				if (address >= ro_start && address < ro_end

							&& address != fv_addr

							&& address != gw_addr)

					pte = __mk_pte(address, PAGE_KERNEL_RO);

				else

				if (address >= ro_start && address < ro_end) {

					pte = __mk_pte(address, PAGE_KERNEL_EXEC);

					pte = pte_mkhuge(pte);

				} else

#endif

				{

					pte = __mk_pte(address, pgprot);

					if (address >= ro_start && address < kernel_end)

						pte = pte_mkhuge(pte);

				}



				if (address >= end_paddr) {

					if (force)
@@ -534,15 +531,12 @@ void free_initmem(void) 


	/* force the kernel to see the new TLB entries */

	__flush_tlb_range(0, init_begin, init_end);

	/* Attempt to catch anyone trying to execute code here

	 * by filling the page with BRK insns.

	 */

	memset((void *)init_begin, 0x00, init_end - init_begin);



	/* finally dump all the instructions which were cached, since the

	 * pages are no-longer executable */

	flush_icache_range(init_begin, init_end);

	

	free_initmem_default(-1);

	free_initmem_default(POISON_FREE_INITMEM);



	/* set up a new led state on systems shipped LED State panel */

	pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE);
@@ -712,8 +706,8 @@ static void __init pagetable_init(void) 
		unsigned long size;



		start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT;

		end_paddr = start_paddr + (pmem_ranges[range].pages << PAGE_SHIFT);

		size = pmem_ranges[range].pages << PAGE_SHIFT;

		end_paddr = start_paddr + size;



		map_pages((unsigned long)__va(start_paddr), start_paddr,

			  size, PAGE_KERNEL, 0);