2 * COPYRIGHT: See COPYING in the top level directory
3 * PROJECT: ReactOS Kernel
4 * FILE: ntoskrnl/include/i386/asmmacro.S
5 * PURPOSE: Assembly Macros for Spinlocks and common Trap Code
6 * PROGRAMMERS: Alex Ionescu (alex@relsoft.net)
7 * Timo Kreuzer (timo.kreuzer@reactos.org)
11 #define INT_32_DPL0 HEX(08E00)
12 #define INT_32_DPL3 HEX(0EE00)
15 // These macros are inlined equivalents of KiAcquire/ReleaseSpinlock, that is,
16 // they will not be compiled into non-SMP builds. Usage is as follows:
20 // ACQUIRE_SPINLOCK(reg, .spin)
21 // <thread-safe code here>
22 // RELEASE_SPINLOCK(reg)
27 // <any necessary steps to be able to jump back safely>
28 // SPIN_ON_LOCK(reg, .BeginYourFunction)
33 #define ACQUIRE_SPINLOCK(x, y) \
34 lock bts dword ptr [x], 0; \
36 #define RELEASE_SPINLOCK(x) mov byte ptr [x], 0
37 #define SPIN_ON_LOCK(x, y) \
39 test dword ptr [x], 1; \
45 #define ACQUIRE_SPINLOCK(x, y)
46 #define RELEASE_SPINLOCK(x)
52 // This macro creates an IDT entry for the given handler
55 // Pointer to the IDT handler
58 // Descriptor Bits to associate
62 MACRO(idt, Handler, Bits)
69 KI_PUSH_FAKE_ERROR_CODE = HEX(0001)
71 KI_NONVOLATILES_ONLY = HEX(0004)
72 KI_FAST_SYSTEM_CALL = HEX(0008)
73 KI_SOFTWARE_TRAP = HEX(0010)
74 KI_HARDWARE_INT = HEX(0020)
75 KI_DONT_SAVE_SEGS = HEX(0100)
77 MACRO(KiEnterTrap, Flags)
82 /* Check what kind of trap frame this trap requires */
83 if (Flags AND KI_FAST_SYSTEM_CALL)
85 /* SYSENTER requires us to build a complete ring transition trap frame */
86 FrameSize = KTRAP_FRAME_V86_ES
88 /* Fixup fs. cx is free to clobber */
92 /* Get pointer to the TSS */
93 mov ecx, fs:[KPCR_TSS]
95 /* Get a stack pointer */
96 mov esp, [ecx + KTSS_ESP0]
98 elseif (Flags AND KI_SOFTWARE_TRAP)
100 /* Software traps need a complete non-ring transition trap frame */
101 FrameSize = KTRAP_FRAME_ESP
103 /* Software traps need to get their EIP from the caller's frame */
106 elseif (Flags AND KI_PUSH_FAKE_ERROR_CODE)
108 /* If the trap doesn't have an error code, we'll make space for it */
109 FrameSize = KTRAP_FRAME_EIP
113 /* The trap already has an error code, so just make space for the rest */
114 FrameSize = KTRAP_FRAME_ERROR_CODE
118 /* Save nonvolatile registers */
119 mov [esp - FrameSize + KTRAP_FRAME_EBP], ebp
120 mov [esp - FrameSize + KTRAP_FRAME_EBX], ebx
121 mov [esp - FrameSize + KTRAP_FRAME_ESI], esi
122 mov [esp - FrameSize + KTRAP_FRAME_EDI], edi
124 /* Save eax for system calls, for use by the C handler */
125 mov [esp - FrameSize + KTRAP_FRAME_EAX], eax
127 /* Does the caller want nonvolatiles only? */
128 if ((Flags AND KI_NONVOLATILES_ONLY) == 0)
129 /* Otherwise, save the volatiles as well */
130 mov [esp - FrameSize + KTRAP_FRAME_ECX], ecx
131 mov [esp - FrameSize + KTRAP_FRAME_EDX], edx
134 /* Save segment registers? */
135 if ((Flags AND KI_DONT_SAVE_SEGS) == 0)
137 /* Check for V86 mode */
138 test byte ptr [esp - FrameSize + KTRAP_FRAME_EFLAGS + 2], (EFLAGS_V86_MASK >> 16)
141 /* Restore V8086 segments into Protected Mode segments */
142 mov eax, [esp - FrameSize + KTRAP_FRAME_V86_DS]
143 mov ecx, [esp - FrameSize + KTRAP_FRAME_V86_ES]
144 mov [esp - FrameSize + KTRAP_FRAME_DS], eax
145 mov [esp - FrameSize + KTRAP_FRAME_ES], ecx
146 mov eax, [esp - FrameSize + KTRAP_FRAME_V86_FS]
147 mov ecx, [esp - FrameSize + KTRAP_FRAME_V86_GS]
148 mov [esp - FrameSize + KTRAP_FRAME_FS], eax
149 mov [esp - FrameSize + KTRAP_FRAME_GS], ecx
154 /* Save segment selectors */
157 mov [esp - FrameSize + KTRAP_FRAME_DS], eax
158 mov [esp - FrameSize + KTRAP_FRAME_ES], ecx
161 mov [esp - FrameSize + KTRAP_FRAME_FS], eax
162 mov [esp - FrameSize + KTRAP_FRAME_GS], ecx
167 /* Load correct data segments */
168 mov ax, KGDT_R3_DATA OR RPL_MASK
172 /* Fast system calls have fs already fixed */
173 if ((Flags AND KI_FAST_SYSTEM_CALL) == 0)
174 /* Otherwise fix fs now */
179 /* Make space for this frame */
182 /* Clear direction flag */
185 /* Set parameter 1 (ECX) to point to the frame */
190 MACRO(TRAP_ENTRY, Trap, Flags)
191 EXTERN @&Trap&Handler@4 :PROC