Hexagon: add support for ARCH_PFN_OFFSET
Add support for loading the kernel at a physical offset. The
offset should still be 4M aligned.
Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index e4decc6..dd89a72 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig
@@ -33,6 +33,7 @@
Qualcomm Hexagon is a processor architecture designed for high
performance and low power across a wide variety of applications.
+
config HEXAGON_ARCH_V1
bool
@@ -45,6 +46,11 @@
config HEXAGON_ARCH_V4
bool
+config HEXAGON_PHYS_OFFSET
+ def_bool y
+ ---help---
+ Platforms that don't load the kernel at zero set this.
+
config FRAME_POINTER
def_bool y
diff --git a/arch/hexagon/include/asm/hexagon_vm.h b/arch/hexagon/include/asm/hexagon_vm.h
index c144bee..6b81e4d 100644
--- a/arch/hexagon/include/asm/hexagon_vm.h
+++ b/arch/hexagon/include/asm/hexagon_vm.h
@@ -31,10 +31,26 @@
* for tracing/debugging.
*/
-/*
- * Lets make this stuff visible only if configured,
- * so we can unconditionally include the file.
- */
+#define HVM_TRAP1_VMVERSION 0
+#define HVM_TRAP1_VMRTE 1
+#define HVM_TRAP1_VMSETVEC 2
+#define HVM_TRAP1_VMSETIE 3
+#define HVM_TRAP1_VMGETIE 4
+#define HVM_TRAP1_VMINTOP 5
+#define HVM_TRAP1_VMCLRMAP 10
+#define HVM_TRAP1_VMNEWMAP 11
+#define HVM_TRAP1_FORMERLY_VMWIRE 12
+#define HVM_TRAP1_VMCACHE 13
+#define HVM_TRAP1_VMGETTIME 14
+#define HVM_TRAP1_VMSETTIME 15
+#define HVM_TRAP1_VMWAIT 16
+#define HVM_TRAP1_VMYIELD 17
+#define HVM_TRAP1_VMSTART 18
+#define HVM_TRAP1_VMSTOP 19
+#define HVM_TRAP1_VMVPID 20
+#define HVM_TRAP1_VMSETREGS 21
+#define HVM_TRAP1_VMGETREGS 22
+#define HVM_TRAP1_VMTIMEROP 24
#ifndef __ASSEMBLY__
@@ -175,25 +191,6 @@
#else /* Only assembly code should reference these */
-#define HVM_TRAP1_VMRTE 1
-#define HVM_TRAP1_VMSETVEC 2
-#define HVM_TRAP1_VMSETIE 3
-#define HVM_TRAP1_VMGETIE 4
-#define HVM_TRAP1_VMINTOP 5
-#define HVM_TRAP1_VMCLRMAP 10
-#define HVM_TRAP1_VMNEWMAP 11
-#define HVM_TRAP1_FORMERLY_VMWIRE 12
-#define HVM_TRAP1_VMCACHE 13
-#define HVM_TRAP1_VMGETTIME 14
-#define HVM_TRAP1_VMSETTIME 15
-#define HVM_TRAP1_VMWAIT 16
-#define HVM_TRAP1_VMYIELD 17
-#define HVM_TRAP1_VMSTART 18
-#define HVM_TRAP1_VMSTOP 19
-#define HVM_TRAP1_VMVPID 20
-#define HVM_TRAP1_VMSETREGS 21
-#define HVM_TRAP1_VMGETREGS 22
-
#endif /* __ASSEMBLY__ */
/*
@@ -224,6 +221,8 @@
#define HVM_VMEST_UM_MSK 1
#define HVM_VMEST_IE_SFT 30
#define HVM_VMEST_IE_MSK 1
+#define HVM_VMEST_SS_SFT 29
+#define HVM_VMEST_SS_MSK 1
#define HVM_VMEST_EVENTNUM_SFT 16
#define HVM_VMEST_EVENTNUM_MSK 0xff
#define HVM_VMEST_CAUSE_SFT 0
@@ -260,6 +259,8 @@
#define HVM_GE_C_INVI 0x15
#define HVM_GE_C_PRIVI 0x1B
#define HVM_GE_C_XMAL 0x1C
+#define HVM_GE_C_WREG 0x1D
+#define HVM_GE_C_PCAL 0x1E
#define HVM_GE_C_RMAL 0x20
#define HVM_GE_C_WMAL 0x21
#define HVM_GE_C_RPROT 0x22
diff --git a/arch/hexagon/include/asm/mem-layout.h b/arch/hexagon/include/asm/mem-layout.h
index af16e97..1426cd7 100644
--- a/arch/hexagon/include/asm/mem-layout.h
+++ b/arch/hexagon/include/asm/mem-layout.h
@@ -32,15 +32,24 @@
#define PAGE_OFFSET _AC(0xc0000000, UL)
/*
- * LOAD_ADDRESS is the physical/linear address of where in memory
- * the kernel gets loaded. The 12 least significant bits must be zero (0)
- * due to limitations on setting the EVB
- *
+ * Compiling for a platform that needs a crazy physical offset
+ * (like if the memory starts at 1GB and up) means we need
+ * an actual PHYS_OFFSET. Should be set up in head.S.
*/
-#ifndef LOAD_ADDRESS
-#define LOAD_ADDRESS 0x00000000
+#ifdef CONFIG_HEXAGON_PHYS_OFFSET
+#ifndef __ASSEMBLY__
+extern unsigned long __phys_offset;
#endif
+#define PHYS_OFFSET __phys_offset
+#endif
+
+#ifndef PHYS_OFFSET
+#define PHYS_OFFSET 0
+#endif
+
+#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
+#define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
#define TASK_SIZE (PAGE_OFFSET)
diff --git a/arch/hexagon/include/asm/page.h b/arch/hexagon/include/asm/page.h
index 692adc213..de1b287 100644
--- a/arch/hexagon/include/asm/page.h
+++ b/arch/hexagon/include/asm/page.h
@@ -96,8 +96,8 @@
* MIPS says they're only used during mem_init.
* also, check if we need a PHYS_OFFSET.
*/
-#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
-#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
+#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
+#define __va(x) ((void *)((unsigned long)(x) - PHYS_OFFSET + PAGE_OFFSET))
/* The "page frame" descriptor is defined in linux/mm.h */
struct page;
@@ -147,6 +147,7 @@
*/
#define kern_addr_valid(addr) (1)
+#include <asm/mem-layout.h>
#include <asm-generic/memory_model.h>
/* XXX Todo: implement assembly-optimized version of getorder. */
#include <asm-generic/getorder.h>
diff --git a/arch/hexagon/kernel/head.S b/arch/hexagon/kernel/head.S
index d859402..477320c 100644
--- a/arch/hexagon/kernel/head.S
+++ b/arch/hexagon/kernel/head.S
@@ -43,14 +43,21 @@
* Symbol is kernel segment address, but we need
* the logical/physical address.
*/
- r24 = asl(r24, #2)
- r24 = lsr(r24, #2)
+ r25 = pc;
+ r2.h = #0xffc0;
+ r2.l = #0x0000;
+ r25 = and(r2,r25); /* R25 holds PHYS_OFFSET now */
+ r1.h = #HI(PAGE_OFFSET);
+ r1.l = #LO(PAGE_OFFSET);
+ r24 = sub(r24,r1); /* swapper_pg_dir - PAGE_OFFSET */
+ r24 = add(r24,r25); /* + PHYS_OFFSET */
- r0 = r24
+ r0 = r24; /* aka __pa(swapper_pg_dir) */
/*
- * Initialize a 16MB PTE to make the virtual and physical
+ * Initialize page dir to make the virtual and physical
* addresses where the kernel was loaded be identical.
+ * Done in 4MB chunks.
*/
#define PTE_BITS ( __HVM_PTE_R | __HVM_PTE_W | __HVM_PTE_X \
| __HEXAGON_C_WB_L2 << 6 \
@@ -143,6 +150,13 @@
r2 = sub(r2,r0);
call memset;
+ /* Set PHYS_OFFSET; should still be in R25 */
+#ifdef CONFIG_HEXAGON_PHYS_OFFSET
+ r0.l = #LO(__phys_offset);
+ r0.h = #HI(__phys_offset);
+ memw(r0) = r25;
+#endif
+
/* Time to make the doughnuts. */
call start_kernel
diff --git a/arch/hexagon/kernel/setup.c b/arch/hexagon/kernel/setup.c
index 94a3878..2e2304f 100644
--- a/arch/hexagon/kernel/setup.c
+++ b/arch/hexagon/kernel/setup.c
@@ -68,6 +68,8 @@
*/
__vmsetvec(_K_VM_event_vector);
+ printk(KERN_INFO "PHYS_OFFSET=0x%08x\n", PHYS_OFFSET);
+
/*
* Simulator has a few differences from the hardware.
* For now, check uninitialized-but-mapped memory
diff --git a/arch/hexagon/kernel/vmlinux.lds.S b/arch/hexagon/kernel/vmlinux.lds.S
index 14e793f..fafb886 100644
--- a/arch/hexagon/kernel/vmlinux.lds.S
+++ b/arch/hexagon/kernel/vmlinux.lds.S
@@ -18,8 +18,6 @@
* 02110-1301, USA.
*/
-#define LOAD_OFFSET PAGE_OFFSET
-
#include <asm-generic/vmlinux.lds.h>
#include <asm/asm-offsets.h> /* Most of the kernel defines are here */
#include <asm/mem-layout.h> /* except for page_offset */
@@ -36,13 +34,9 @@
#define PAGE_SIZE _PAGE_SIZE
-/* This LOAD_OFFSET is temporary for debugging on the simulator; it may change
- for hypervisor pseudo-physical memory. */
-
-
SECTIONS
{
- . = PAGE_OFFSET + LOAD_ADDRESS;
+ . = PAGE_OFFSET;
__init_begin = .;
HEAD_TEXT_SECTION
@@ -52,7 +46,7 @@
. = ALIGN(_PAGE_SIZE);
_stext = .;
- .text : AT(ADDR(.text) - LOAD_OFFSET) {
+ .text : AT(ADDR(.text)) {
_text = .;
TEXT_TEXT
SCHED_TEXT
diff --git a/arch/hexagon/mm/init.c b/arch/hexagon/mm/init.c
index 69ffcfd..8e803a6 100644
--- a/arch/hexagon/mm/init.c
+++ b/arch/hexagon/mm/init.c
@@ -31,9 +31,10 @@
* Define a startpg just past the end of the kernel image and a lastpg
* that corresponds to the end of real or simulated platform memory.
*/
-#define bootmem_startpg (PFN_UP(((unsigned long) _end) - PAGE_OFFSET))
+#define bootmem_startpg (PFN_UP(((unsigned long) _end) - PAGE_OFFSET + PHYS_OFFSET))
-unsigned long bootmem_lastpg; /* Should be set by platform code */
+unsigned long bootmem_lastpg; /* Should be set by platform code */
+unsigned long __phys_offset; /* physical kernel offset >> 12 */
/* Set as variable to limit PMD copies */
int max_kernel_seg = 0x303;
@@ -44,7 +45,6 @@
/* indicate pfn's of high memory */
unsigned long highstart_pfn, highend_pfn;
-/* struct mmu_gather defined in asm-generic.h; */
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
/* Default cache attribute for newly created page tables */
@@ -71,7 +71,7 @@
{
/* No idea where this is actually declared. Seems to evade LXR. */
totalram_pages += free_all_bootmem();
- num_physpages = bootmem_lastpg; /* seriously, what? */
+ num_physpages = bootmem_lastpg-ARCH_PFN_OFFSET;
printk(KERN_INFO "totalram_pages = %ld\n", totalram_pages);
@@ -193,6 +193,9 @@
* This needs to change for highmem setups.
*/
+ /* Prior to this, bootmem_lastpg is actually mem size */
+ bootmem_lastpg += ARCH_PFN_OFFSET;
+
/* Memory size needs to be a multiple of 16M */
bootmem_lastpg = PFN_DOWN((bootmem_lastpg << PAGE_SHIFT) &
~((BIG_KERNEL_PAGE_SIZE) - 1));
@@ -201,12 +204,15 @@
* Reserve the top DMA_RESERVE bytes of RAM for DMA (uncached)
* memory allocation
*/
- bootmap_size = init_bootmem(bootmem_startpg, bootmem_lastpg -
- PFN_DOWN(DMA_RESERVED_BYTES));
+
+ max_low_pfn = bootmem_lastpg - PFN_DOWN(DMA_RESERVED_BYTES);
+ min_low_pfn = ARCH_PFN_OFFSET;
+ bootmap_size = init_bootmem_node(NODE_DATA(0), bootmem_startpg, min_low_pfn, max_low_pfn);
printk(KERN_INFO "bootmem_startpg: 0x%08lx\n", bootmem_startpg);
printk(KERN_INFO "bootmem_lastpg: 0x%08lx\n", bootmem_lastpg);
printk(KERN_INFO "bootmap_size: %d\n", bootmap_size);
+ printk(KERN_INFO "min_low_pfn: 0x%08lx\n", min_low_pfn);
printk(KERN_INFO "max_low_pfn: 0x%08lx\n", max_low_pfn);
/*
@@ -221,14 +227,17 @@
/* this actually only goes to the end of the first gig */
segtable_end = segtable + (1<<(30-22));
- /* Move forward to the start of empty pages */
- segtable += bootmem_lastpg >> (22-PAGE_SHIFT);
+ /*
+ * Move forward to the start of empty pages; take into account
+ * phys_offset shift.
+ */
+ segtable += (bootmem_lastpg-ARCH_PFN_OFFSET)>>(22-PAGE_SHIFT);
{
- int i;
+ int i;
- for (i = 1 ; i <= DMA_RESERVE ; i++)
- segtable[-i] = ((segtable[-i] & __HVM_PTE_PGMASK_4MB)
+ for (i = 1 ; i <= DMA_RESERVE ; i++)
+ segtable[-i] = ((segtable[-i] & __HVM_PTE_PGMASK_4MB)
| __HVM_PTE_R | __HVM_PTE_W | __HVM_PTE_X
| __HEXAGON_C_UNC << 6
| __HVM_PDE_S_4MB);
@@ -256,7 +265,7 @@
* Free all the memory that wasn't taken up by the bootmap, the DMA
* reserve, or kernel itself.
*/
- free_bootmem(PFN_PHYS(bootmem_startpg)+bootmap_size,
+ free_bootmem(PFN_PHYS(bootmem_startpg) + bootmap_size,
PFN_PHYS(bootmem_lastpg - bootmem_startpg) - bootmap_size -
DMA_RESERVED_BYTES);