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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Minios-devel] [PATCH v3 02/43] arm32: remove the arm32 specific code file
This patch removes the arm32 specific code file:
arm32.S, hypercalls32.S, minios-arm32.lds
Signed-off-by: Huang Shijie <shijie.huang@xxxxxxx>
---
arch/arm/arm32.S | 294 ----------------------------------------------
arch/arm/hypercalls32.S | 64 ----------
arch/arm/minios-arm32.lds | 83 -------------
3 files changed, 441 deletions(-)
delete mode 100644 arch/arm/arm32.S
delete mode 100644 arch/arm/hypercalls32.S
delete mode 100755 arch/arm/minios-arm32.lds
diff --git a/arch/arm/arm32.S b/arch/arm/arm32.S
deleted file mode 100644
index bcaca17..0000000
--- a/arch/arm/arm32.S
+++ /dev/null
@@ -1,294 +0,0 @@
-@ Offset of the kernel within the RAM. This is a Linux/zImage convention which
we
-@ rely on for now.
-#define ZIMAGE_KERNEL_OFFSET 0x8000
-
-.section .text
-
-.globl _start
-_start:
- @ zImage header
-.rept 8
- mov r0, r0
-.endr
- b reset
- .word 0x016f2818 @ Magic numbers to help the loader
- .word 0 @ zImage start address (0 = relocatable)
- .word _edata - _start @ zImage end address (excludes bss section)
- @ end of zImage header
-
-@ Called at boot time. Sets up MMU, exception vectors and stack, and then
calls C arch_init() function.
-@ => r2 -> DTB
-@ <= never returns
-@ Note: this boot code needs to be within the first (1MB -
ZIMAGE_KERNEL_OFFSET) of _start.
-reset:
- @ Problem: the C code wants to be at a known address (_start), but Xen
might
- @ load us anywhere. We initialise the MMU (mapping virtual to physical
@ addresses)
- @ so everything ends up where the code expects it to be.
- @
- @ We calculate the offet between where the linker thought _start would
be and where
- @ it actually is and initialise the page tables to have that offset for
every page.
- @
- @ When we turn on the MMU, we're still executing at the old address. We
don't want
- @ the code to disappear from under us. So we have to do the mapping in
stages:
- @
- @ 1. set up a mapping to our current page from both its current and
desired addresses
- @ 2. enable the MMU
- @ 3. jump to the new address
- @ 4. remap all the other pages with the calculated offset
-
- adr r1, _start @ r1 = physical address of _start
- ldr r3, =_start @ r3 = (desired) virtual address of
_start
- sub r9, r1, r3 @ r9 = (physical - virtual) offset
-
- ldr r7, =_page_dir @ r7 = (desired) virtual addr of
translation table
- add r1, r7, r9 @ r1 = physical addr of translation
table
-
- @ Tell the system where our page table is located.
- @ This is the 16 KB top-level translation table, in which
- @ each word maps one 1MB virtual section to a physical section.
- @ Note: We leave TTBCR as 0, meaning that only TTBR0 is used and
- @ we use the short-descriptor format (32-bit physical addresses).
- orr r0, r1, #0b0001011 @ Sharable, Inner/Outer Write-Back
Write-Allocate Cacheable
- mcr p15, 0, r0, c2, c0, 0 @ set TTBR0
-
- @ Set access permission for domains.
- @ Domains are deprecated, but we have to configure them anyway.
- @ We mark every page as being domain 0 and set domain 0 to "client mode"
- @ (client mode = use access flags in page table).
- mov r0, #1 @ 1 = client
- mcr p15, 0, r0, c3, c0, 0 @ DACR
-
- @ Template (flags) for a 1 MB page-table entry.
- @ TEX[2:0] C B = 001 1 1 (outer and inner write-back, write-allocate)
- ldr r8, =(0x2 + /* Section entry */ \
- 0xc + /* C B */ \
- (3 << 10) + /* Read/write */ \
- (1 << 12) + /* TEX */ \
- (1 << 16) + /* Sharable */ \
- (1<<19)) /* Non-secure */
- @ r8 = template page table entry
-
- @ Add an entry for the current physical section, at the old and new
- @ addresses. It's OK if they're the same.
- mov r0, pc, lsr#20
- mov r0, r0, lsl#20 @ r0 = physical address of this code's
section start
- orr r3, r0, r8 @ r3 = table entry for this section
- ldr r4, =_start @ r4 = desired virtual address of this
section
- str r3, [r1, r4, lsr#18] @ map desired virtual section to this
code
- str r3, [r1, r0, lsr#18] @ map current section to this code too
-
- @ Invalidate TLB
- dsb @ Caching is off, but must still
prevent reordering
- mcr p15, 0, r1, c8, c7, 0 @ TLBIALL
-
- @ Enable MMU / SCTLR
- mrc p15, 0, r1, c1, c0, 0 @ SCTLR
- orr r1, r1, #3 << 11 @ enable icache, branch prediction
- orr r1, r1, #4 + 1 @ enable dcache, MMU
- mcr p15, 0, r1, c1, c0, 0 @ SCTLR
- isb
-
- ldr r1, =stage2 @ Virtual address of stage2
- bx r1
-
-@ Called once the MMU is enabled. The boot code and the page table are mapped,
-@ but nothing else is yet.
-@
-@ => r2 -> dtb (physical)
-@ r7 = virtual address of page table
-@ r8 = section entry template (flags)
-@ r9 = desired physical - virtual offset
-@ pc -> somewhere in newly-mapped virtual code section
-stage2:
- @ Invalidate TLB
- mcr p15, 0, r1, c8, c7, 0 @ TLBIALL
- isb
-
- @ The new mapping has now taken effect:
- @ r7 -> page_dir
-
- @ Fill in the whole top-level translation table (at page_dir).
- @ Populate the whole pagedir with 1MB section descriptors.
-
- mov r1, r7 @ r1 -> first section entry
- add r3, r1, #4*4*1024 @ limit (4 GB address space, 4 byte
entries)
- orr r0, r8, r9 @ r0 = entry mapping section zero to
start of physical RAM
-1:
- str r0, [r1],#4 @ write the section entry
- add r0, r0, #1 << 20 @ next physical page (wraps)
- cmp r1, r3
- bne 1b
-
- @ Invalidate TLB
- dsb
- mcr p15, 0, r1, c8, c7, 0 @ TLBIALL
- isb
-
- @ Set VBAR -> exception_vector_table
- @ SCTLR.V = 0
- adr r0, exception_vector_table
- mcr p15, 0, r0, c12, c0, 0
-
- @ Enable hardware floating point:
- @ 1. Access to CP10 and CP11 must be enabled in the Coprocessor Access
- @ Control Register (CP15.CACR):
- mrc p15, 0, r1, c1, c0, 2 @ CACR
- orr r1, r1, #(3 << 20) + (3 << 22) @ full access for CP10 & CP11
- mcr p15, 0, r1, c1, c0, 2
- @ 2. The EN bit in the FPEXC register must be set:
- vmrs r0, FPEXC
- orr r0, r0, #1<<30 @ EN (enable)
- vmsr FPEXC, r0
-
- @ Initialise 16 KB stack
- ldr sp, =_boot_stack_end
-
- sub r0, r2, r9 @ r0 -> device tree (virtual address)
- mov r1, r9 @ r1 = physical_address_offset
-
- b arch_init
-
-.pushsection .bss
-@ Note: calling arch_init zeroes out this region.
-.align 12
-.globl shared_info
-shared_info:
- .fill (1024), 4, 0x0
-
-.align 3
-.globl irqstack
-.globl irqstack_end
-irqstack:
- .fill (1024), 4, 0x0
-irqstack_end:
-
-fault_dump:
- .fill 18, 4, 0x0 @ On fault, we save the registers +
CPSR + handler address
-
-.popsection
-
-fault:
- cpsid aif @ Disable interrupts
-
- ldr r13, =fault_dump
- stmia r13, {r0-r12} @ Dump the non-banked registers
directly (well, unless from FIQ mode)
- str r14, [r13, #15 << 2] @ Our r14 is the faulting r15
- mov r0, r13
-
- @ Save the caller's CPSR (our SPSR) too.
- mrs r1, SPSR
- str r1, [r13, #16 << 2]
-
- @ Switch to the mode we came from to get r13 and r14.
- @ If coming from user mode, use System mode instead so we're still
- @ privileged.
- and r1, r1, #0x1f @ r1 = SPSR mode
- cmp r1, #0x10 @ If from User mode
- moveq r1, #0x1f @ Then use System mode instead
-
- mrs r3, CPSR @ r3 = our CPSR
- bic r2, r3, #0x1f
- orr r2, r2, r1
- msr CPSR, r2 @ Change to mode r1
-
- @ Save old mode's r13, r14
- str r13, [r0, #13 << 2]
- str r14, [r0, #14 << 2]
-
- msr CPSR, r3 @ Back to fault mode
-
- ldr r1, [r0, #17 << 2]
- sub r1, r1, #12 @ Fix to point at start of handler
- str r1, [r0, #17 << 2]
-
- @ Call C code to format the register dump.
- @ Clobbers the stack, but we're not going to return anyway.
- ldr sp, =_boot_stack_end
- bl dump_registers
- b do_exit
-
-@ We want to store a unique value to identify this handler, without corrupting
-@ any of the registers. So, we store r15 (which will point just after the
branch).
-@ Later, we subtract 12 so the user gets pointed at the start of the exception
-@ handler.
-#define FAULT(name) \
-.globl fault_##name; \
-fault_##name: \
- ldr r13, =fault_dump; \
- str r15, [r13, #17 << 2]; \
- b fault
-
-FAULT(reset)
-FAULT(undefined_instruction)
-FAULT(svc)
-FAULT(prefetch_call)
-FAULT(prefetch_abort)
-FAULT(data_abort)
-
-@ exception base address
-.align 5
-.globl exception_vector_table
-@ Note: remember to call CLREX if returning from an exception:
-@ "The architecture enables the local monitor to treat any exclusive store as
-@ matching a previous LDREX address. For this reason, use of the CLREX
-@ instruction to clear an existing tag is required on context switches."
-@ -- ARM Cortex-A Series Programmer’s Guide (Version: 4.0)
-exception_vector_table:
- b fault_reset
- b fault_undefined_instruction
- b fault_svc
- b fault_prefetch_call
- b fault_prefetch_abort
- b fault_data_abort
- b irq_handler @ IRQ
- .word 0xe7f000f0 @ abort on FIQ
-
-@ Call fault_undefined_instruction in "Undefined mode"
-bug:
- .word 0xe7f000f0 @ und/udf - a "Permanently Undefined"
instruction
-
-irq_handler:
- ldr sp, =irqstack_end
- push {r0 - r12, r14}
-
- ldr r0, IRQ_handler
- cmp r0, #0
- beq bug
- blx r0 @ call handler
-
- @ Return from IRQ
- pop {r0 - r12, r14}
- clrex
- subs pc, lr, #4
-
-.globl IRQ_handler
-IRQ_handler:
- .long 0x0
-
-
-.globl __arch_switch_threads
-@ => r0 = &prev->sp
-@ r1 = &next->sp
-@ <= returns to next thread's saved return address
-__arch_switch_threads:
- push {r4-r11} @ Store callee-saved registers to old thread's
stack
- stmia r0, {sp, lr} @ Store current sp and ip to prev's struct
thread
-
- ldmia r1, {sp, lr} @ Load new sp, ip from next's struct thread
- pop {r4-r11} @ Load callee-saved registers from new thread's
stack
-
- bx lr
-
-@ This is called if you try to divide by zero. For now, we make a supervisor
call,
-@ which will make us halt.
-.globl raise
-raise:
- svc 0
-
-.globl arm_start_thread
-arm_start_thread:
- pop {r0, r1}
- @ r0 = user data
- @ r1 -> thread's main function
- ldr lr, =exit_thread
- bx r1
diff --git a/arch/arm/hypercalls32.S b/arch/arm/hypercalls32.S
deleted file mode 100644
index af8e175..0000000
--- a/arch/arm/hypercalls32.S
+++ /dev/null
@@ -1,64 +0,0 @@
-/******************************************************************************
- * hypercall.S
- *
- * Xen hypercall wrappers
- *
- * Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Citrix, 2012
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation; or, when distributed
- * separately from the Linux kernel or incorporated into other
- * software packages, subject to the following license:
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this source file (the "Software"), to deal in the Software without
- * restriction, including without limitation the rights to use, copy, modify,
- * merge, publish, distribute, sublicense, and/or sell copies of the Software,
- * and to permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
- * IN THE SOFTWARE.
- */
-
-#include <xen/xen.h>
-
-#define __HVC(imm16) .long ((0xE1400070 | (((imm16) & 0xFFF0) << 4) | ((imm16)
& 0x000F)) & 0xFFFFFFFF)
-
-#define XEN_IMM 0xEA1
-
-#define HYPERCALL_SIMPLE(hypercall) \
-.globl HYPERVISOR_##hypercall; \
-.align 4,0x90; \
-HYPERVISOR_##hypercall: \
- mov r12, #__HYPERVISOR_##hypercall; \
- __HVC(XEN_IMM); \
- mov pc, lr;
-
-#define _hypercall0 HYPERCALL_SIMPLE
-#define _hypercall1 HYPERCALL_SIMPLE
-#define _hypercall2 HYPERCALL_SIMPLE
-#define _hypercall3 HYPERCALL_SIMPLE
-#define _hypercall4 HYPERCALL_SIMPLE
-
-_hypercall2(sched_op);
-_hypercall2(memory_op);
-_hypercall2(event_channel_op);
-_hypercall2(xen_version);
-_hypercall3(console_io);
-_hypercall1(physdev_op);
-_hypercall3(grant_table_op);
-_hypercall3(vcpu_op);
-_hypercall1(sysctl);
-_hypercall1(domctl);
-_hypercall2(hvm_op);
-_hypercall1(xsm_op);
diff --git a/arch/arm/minios-arm32.lds b/arch/arm/minios-arm32.lds
deleted file mode 100755
index 9627162..0000000
--- a/arch/arm/minios-arm32.lds
+++ /dev/null
@@ -1,83 +0,0 @@
-OUTPUT_ARCH(arm)
-ENTRY(_start)
-SECTIONS
-{
- /* Note: we currently assume that Xen will load the kernel image
- * at start-of-RAM + 0x8000. We use this initial 32 KB for the stack
- * and translation tables.
- */
- _boot_stack = 0x400000; /* 16 KB boot stack */
- _boot_stack_end = 0x404000;
- _page_dir = 0x404000; /* 16 KB translation table */
- . = 0x408000;
- _text = .; /* Text and read-only data */
- .text : {
- *(.text)
- *(.gnu.warning)
- } = 0x9090
-
- _etext = .; /* End of text section */
-
- .rodata : { *(.rodata) *(.rodata.*) }
- . = ALIGN(4096);
- _erodata = .;
-
- /* newlib initialization functions */
- . = ALIGN(32 / 8);
- PROVIDE (__preinit_array_start = .);
- .preinit_array : { *(.preinit_array) }
- PROVIDE (__preinit_array_end = .);
- PROVIDE (__init_array_start = .);
- .init_array : { *(.init_array) }
- PROVIDE (__init_array_end = .);
- PROVIDE (__fini_array_start = .);
- .fini_array : { *(.fini_array) }
- PROVIDE (__fini_array_end = .);
-
- .ctors : {
- __CTOR_LIST__ = .;
- *(.ctors)
- CONSTRUCTORS
- LONG(0)
- __CTOR_END__ = .;
- }
-
- .dtors : {
- __DTOR_LIST__ = .;
- *(.dtors)
- LONG(0)
- __DTOR_END__ = .;
- }
-
- .data : { /* Data */
- *(.data)
- }
-
- /* Note: linker will insert any extra sections here, just before .bss */
-
- .bss : {
- _edata = .; /* End of data included in image */
- /* Nothing after here is included in the zImage's size */
-
- __bss_start = .;
- *(.bss)
- *(.app.bss)
- }
- _end = . ;
-
- /* Sections to be discarded */
- /DISCARD/ : {
- *(.text.exit)
- *(.data.exit)
- *(.exitcall.exit)
- }
-
- /* Stabs debugging sections. */
- .stab 0 : { *(.stab) }
- .stabstr 0 : { *(.stabstr) }
- .stab.excl 0 : { *(.stab.excl) }
- .stab.exclstr 0 : { *(.stab.exclstr) }
- .stab.index 0 : { *(.stab.index) }
- .stab.indexstr 0 : { *(.stab.indexstr) }
- .comment 0 : { *(.comment) }
-}
--
2.7.4
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