Fork us on GitHub Follow us on Facebook Follow us on Twitter

Changeset 64bbf13 in mainline


Ignore:
Timestamp:
2010-07-01T18:39:48Z (11 years ago)
Author:
Martin Decky <martin@…>
Branches:
master
Children:
75c9852
Parents:
fc14438
Message:

switch to C-style comments

File:
1 edited

Legend:

Unmodified
Added
Removed
  • kernel/arch/amd64/src/asm_utils.S

    rfc14438 r64bbf13  
    1 #
    2 # Copyright (c) 2005 Ondrej Palkovsky
    3 # All rights reserved.
    4 #
    5 # Redistribution and use in source and binary forms, with or without
    6 # modification, are permitted provided that the following conditions
    7 # are met:
    8 #
    9 # - Redistributions of source code must retain the above copyright
    10 #   notice, this list of conditions and the following disclaimer.
    11 # - Redistributions in binary form must reproduce the above copyright
    12 #   notice, this list of conditions and the following disclaimer in the
    13 #   documentation and/or other materials provided with the distribution.
    14 # - The name of the author may not be used to endorse or promote products
    15 #   derived from this software without specific prior written permission.
    16 #
    17 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
    18 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    19 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
    20 # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
    21 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
    22 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    23 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    24 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    25 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
    26 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    27 #
     1/*
     2 * Copyright (c) 2005 Ondrej Palkovsky
     3 * All rights reserved.
     4 *
     5 * Redistribution and use in source and binary forms, with or without
     6 * modification, are permitted provided that the following conditions
     7 * are met:
     8 *
     9 * - Redistributions of source code must retain the above copyright
     10 *   notice, this list of conditions and the following disclaimer.
     11 * - Redistributions in binary form must reproduce the above copyright
     12 *   notice, this list of conditions and the following disclaimer in the
     13 *   documentation and/or other materials provided with the distribution.
     14 * - The name of the author may not be used to endorse or promote products
     15 *   derived from this software without specific prior written permission.
     16 *
     17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 */
    2828
    2929#define IREGISTER_SPACE  80
     
    4040#define IOFFSET_RBP  0x48
    4141
    42 # Mask for interrupts 0 - 31 (bits 0 - 31) where 0 means that int
    43 # has no error word  and 1 means interrupt with error word
    44 
     42/**
     43 * Mask for interrupts 0 - 31 (bits 0 - 31) where 0 means that int
     44 * has no error word  and 1 means interrupt with error word
     45 *
     46 */
    4547#define ERROR_WORD_INTERRUPT_LIST  0x00027D00
    4648
     
    6365.global memcpy_to_uspace_failover_address
    6466
    65 # Wrapper for generic memsetb
     67/* Wrapper for generic memsetb */
    6668memsetb:
    6769        jmp _memsetb
    6870
    69 # Wrapper for generic memsetw
     71/* Wrapper for generic memsetw */
    7072memsetw:
    7173        jmp _memsetw
     
    115117        ret
    116118
    117 ## Determine CPUID support
    118 #
    119 # Return 0 in EAX if CPUID is not support, 1 if supported.
    120 #
     119/** Determine CPUID support
     120*
     121* @return 0 in EAX if CPUID is not support, 1 if supported.
     122*
     123*/
    121124has_cpuid:
    122         pushfq                 # store flags
    123         popq %rax              # read flags
    124         movq %rax, %rdx        # copy flags
    125         btcl $21, %edx         # swap the ID bit
     125        /* Load RFLAGS */
     126        pushfq
     127        popq %rax
     128        movq %rax, %rdx
     129       
     130        /* Flip the ID bit */
     131        btcl $21, %edx
     132       
     133        /* Store RFLAGS */
    126134        pushq %rdx
    127         popfq                  # propagate the change into flags
     135        popfq
    128136        pushfq
    129         popq %rdx              # read flags
    130         andl $(1 << 21), %eax  # interested only in ID bit
     137       
     138        /* Get the ID bit again */
     139        popq %rdx
     140        andl $(1 << 21), %eax
    131141        andl $(1 << 21), %edx
    132         xorl %edx, %eax        # 0 if not supported, 1 if supported
     142       
     143        /* 0 if not supported, 1 if supported */
     144        xorl %edx, %eax
    133145        ret
    134146
    135147cpuid:
    136         movq %rbx, %r10        # we have to preserve rbx across function calls
    137        
    138         movl %edi,%eax         # load the command into %eax
     148        /* Preserve %rbx across function calls */
     149        movq %rbx, %r10
     150       
     151        /* Load the command into %eax */
     152        movl %edi, %eax
    139153       
    140154        cpuid
     
    154168        ret
    155169
    156 read_efer_flag: 
     170read_efer_flag:
    157171        movq $0xc0000080, %rcx
    158172        rdmsr
    159173        ret
    160174
    161 # Push all volatile general purpose registers on stack
     175/** Push all volatile general purpose registers on stack
     176 *
     177 */
    162178.macro save_all_gpr
    163179        movq %rax, IOFFSET_RAX(%rsp)
     
    188204#define INTERRUPT_ALIGN  128
    189205
    190 ## Declare interrupt handlers
    191 #
    192 # Declare interrupt handlers for n interrupt
    193 # vectors starting at vector i.
    194 #
    195 # The handlers call exc_dispatch().
    196 #
     206/** Declare interrupt handlers
     207 *
     208 * Declare interrupt handlers for n interrupt
     209 * vectors starting at vector i.
     210 *
     211 * The handlers call exc_dispatch().
     212 *
     213 */
    197214.macro handler i n
    198215       
     
    227244        save_all_gpr
    228245        cld
    229 
    230         #
    231         # Stop stack traces here if we came from userspace.
    232         #
     246       
     247        /*
     248         * Stop stack traces here if we came from userspace.
     249         */
    233250        movq %cs, %rax
    234251        xorq %rdx, %rdx
     
    236253        cmovneq %rdx, %rbp
    237254
    238         movq $(\i), %rdi        # %rdi - first parameter
    239         movq %rsp, %rsi         # %rsi - pointer to istate
    240         call exc_dispatch       # exc_dispatch(i, istate)
     255        movq $(\i), %rdi   /* %rdi - first argument */
     256        movq %rsp, %rsi    /* %rsi - pointer to istate */
     257       
     258        /* Call exc_dispatch(i, istate) */
     259        call exc_dispatch
    241260       
    242261        restore_all_gpr
    243         # $8 = Skip error word
     262       
     263        /* $8 = Skip error word */
    244264        addq $(IREGISTER_SPACE + 8), %rsp
    245265        iretq
     
    257277        h_end:
    258278
    259 ## Low-level syscall handler
    260 #
    261 # Registers on entry:
    262 #
    263 # @param rcx Userspace return address.
    264 # @param r11 Userspace RLFAGS.
    265 #
    266 # @param rax Syscall number.
    267 # @param rdi 1st syscall argument.
    268 # @param rsi 2nd syscall argument.
    269 # @param rdx 3rd syscall argument.
    270 # @param r10 4th syscall argument. Used instead of RCX because
    271 #            the SYSCALL instruction clobbers it.
    272 # @param r8  5th syscall argument.
    273 # @param r9  6th syscall argument.
    274 #
    275 # @return Return value is in rax.
    276 #
     279/** Low-level syscall handler
     280 *
     281 * Registers on entry:
     282 *
     283 * @param %rcx Userspace return address.
     284 * @param %r11 Userspace RLFAGS.
     285 *
     286 * @param %rax Syscall number.
     287 * @param %rdi 1st syscall argument.
     288 * @param %rsi 2nd syscall argument.
     289 * @param %rdx 3rd syscall argument.
     290 * @param %r10 4th syscall argument. Used instead of RCX because
     291 *             the SYSCALL instruction clobbers it.
     292 * @param %r8  5th syscall argument.
     293 * @param %r9  6th syscall argument.
     294 *
     295 * @return Return value is in %rax.
     296 *
     297 */
    277298syscall_entry:
    278         swapgs            # Switch to hidden gs
    279         #
    280         # %gs:0 Scratch space for this thread's user RSP
    281         # %gs:8 Address to be used as this thread's kernel RSP
    282         #
    283         movq %rsp, %gs:0  # Save this thread's user RSP
    284         movq %gs:8, %rsp  # Set this thread's kernel RSP
    285         swapgs            # Switch back to remain consistent
     299        /* Switch to hidden %gs */
     300        swapgs
     301       
     302        /*
     303         * %gs:0 Scratch space for this thread's user RSP
     304         * %gs:8 Address to be used as this thread's kernel RSP
     305         */
     306       
     307        movq %rsp, %gs:0  /* save this thread's user RSP */
     308        movq %gs:8, %rsp  /* set this thread's kernel RSP */
     309       
     310        /* Switch back to remain consistent */
     311        swapgs
    286312        sti
    287313       
     
    289315        pushq %r11
    290316        pushq %rbp
    291 
    292         xorq %rbp, %rbp         # stop the stack traces here
    293 
    294         movq %r10, %rcx         # Copy the 4th argument where it is expected
     317       
     318        xorq %rbp, %rbp  /* stop the stack traces here */
     319       
     320        /* Copy the 4th argument where it is expected  */
     321        movq %r10, %rcx
    295322        pushq %rax
     323       
    296324        call syscall_handler
     325       
    297326        addq $8, %rsp
    298                
     327       
    299328        popq %rbp
    300329        popq %r11
     
    303332        cli
    304333        swapgs
    305         movq %gs:0, %rsp  # Restore the user RSP
     334       
     335        /* Restore the user RSP */
     336        movq %gs:0, %rsp
    306337        swapgs
    307338       
Note: See TracChangeset for help on using the changeset viewer.