[FREELDR]

- Use the new realmode code for PxeCallApi, SoftReboot and ChainLoadBiosBootSectorCode
- Remove o386cpi.S from build, the functions are not used
- Use constants for function ids
- Fix a warning

svn path=/trunk/; revision=52284

reactos/boot/freeldr/freeldr/CMakeLists.txt

@@ -16,11 +16,8 @@ if(ARCH MATCHES i386)
         arch/i386/i386bug.c)
     if(NOT MSVC)
         list(APPEND FREELDR_BASE64K_SOURCE
-            arch/i386/boot.S
             arch/i386/drvmap.S
-            arch/i386/i386cpu.S
             arch/i386/i386pnp.S
-            arch/i386/i386pxe.S
             arch/i386/linux.S
             arch/i386/multiboot.S
             arch/i386/mb.S)
@@ -32,8 +29,6 @@ elseif(ARCH MATCHES amd64)
     if(NOT MSVC)
         list(APPEND FREELDR_BASE64K_SOURCE
             arch/i386/drvmap.S
-            arch/i386/i386cpu.S
-            arch/i386/i386idt.S
             arch/i386/i386trap.S
             arch/amd64/mb.S)
     else()

reactos/boot/freeldr/freeldr/arch/i386/entry.S

@@ -259,8 +259,8 @@ _Int386:
     mov ecx, 9
     rep movsd
 
-    /* Set the callback index */
+    /* Set the function ID */
-    mov bx, 0
+    mov bx, FNID_Int386
 
     /* Set continue address and switch to real mode */
     mov dword ptr [ContinueAddress], offset Int386_return
@@ -282,6 +282,86 @@ Int386_return:
     ret
 
 
+/*
+ * U16 PxeCallApi(U16 Segment, U16 Offset, U16 Service, VOID *Parameter);
+ *
+ * RETURNS:
+ */
+PUBLIC _PxeCallApi
+_PxeCallApi:
+    push ebp
+    mov ebp, esp
+
+    pusha
+    push es
+
+    /* copy entry point */
+    mov eax, [ebp + 8]
+    shl eax, 16
+    mov ax, [ebp + 12]
+    mov dword ptr ds:[BSS_PxeEntryPoint], eax
+
+    /* copy function */
+    mov ax, [ebp + 16]
+    mov word ptr ds:[BSS_PxeFunction], ax
+
+    /* convert pointer to data buffer to segment/offset */
+    mov eax, [ebp + 20]
+    shr eax, 4
+    and eax, HEX(0f000)
+    mov word ptr ds:[BSS_PxeBufferSegment], ax
+    mov eax, [ebp + 20]
+    and eax, HEX(0ffff)
+    mov word ptr ds:[BSS_PxeBufferOffset], ax
+
+    /* Set the function ID and call realmode */
+    mov bx, FNID_PxeCallApi
+    call i386CallRealMode
+
+    pop es
+    popa
+
+    mov esp, ebp
+    pop ebp
+
+    mov ax, word ptr [BSS_PxeResult]
+
+    ret
+
+
+PUBLIC _SoftReboot
+_SoftReboot:
+    /* Set the function ID */
+    mov bx, FNID_SoftReboot
+
+    /*Switch to real mode (We don't return) */
+    jmp SwitchToReal
+
+
+PUBLIC _ChainLoadBiosBootSectorCode
+_ChainLoadBiosBootSectorCode:
+    /* Set the boot drive */
+    mov dl, byte ptr [_FrldrBootDrive]
+
+    /* Set the function ID */
+    mov bx, FNID_ChainLoadBiosBootSectorCode
+
+    /*Switch to real mode (We don't return) */
+    jmp SwitchToReal
+
+
+PUBLIC i386CallRealMode
+i386CallRealMode:
+    /* Set continue address and switch to real mode */
+    mov dword ptr [ContinueAddress], offset i386CallRealMode_return
+    jmp SwitchToReal
+i386CallRealMode_return:
+    ret
+
+
+/* Entrypoint for realmode function calls
+ * ContinueAddress must be set to the return point from realmode
+ * bx must be set to the ID of the realmode function to call. */
 SwitchToReal:
     /* Set sane segments */
 	mov ax, PMODE_DS

reactos/boot/freeldr/freeldr/arch/i386/i386idt.c

@@ -3,7 +3,7 @@
 
 
 KIDTENTRY DECLSPEC_ALIGN(4) i386Idt[32];
-KDESCRIPTOR i386IdtDescriptor = {0, 255, i386Idt};
+KDESCRIPTOR i386IdtDescriptor = {0, 255, (ULONG)i386Idt};
 
 static
 void

reactos/boot/freeldr/freeldr/arch/i386/realmode.S

@@ -20,18 +20,12 @@ _kernel_pagetable:
 PUBLIC _lowmem_pagetable
 _lowmem_pagetable:
 
-PUBLIC _ChainLoadBiosBootSectorCode
-_ChainLoadBiosBootSectorCode:
-
 PUBLIC _BootOldLinuxKernel
 _BootOldLinuxKernel:
 
 PUBLIC _BootNewLinuxKernel
 _BootNewLinuxKernel:
 
-PUBLIC _SoftReboot
-_SoftReboot:
-
 PUBLIC _DriveMapOldInt13HandlerAddress
 _DriveMapOldInt13HandlerAddress:
 
@@ -53,7 +47,4 @@ _PnpBiosGetDeviceNodeCount:
 PUBLIC _PnpBiosSupported
 _PnpBiosSupported:
 
-PUBLIC _PxeCallApi
-_PxeCallApi:
-
 END

reactos/boot/freeldr/freeldr/arch/realmode/helpers.inc

@@ -102,3 +102,19 @@ SoftReboot:
 
 	/* and jump to location FFFF:0 in ROM */
 	ljmp16	HEX(0FFFF), HEX(0000)
+
+
+ChainLoadBiosBootSectorCode:
+
+    /* Load segment registers */
+    cli
+    xor ax, ax
+    mov ds, ax
+    mov es, ax
+    mov fs, ax
+    mov gs, ax
+    mov ss, ax
+    mov esp, HEX(7C00)
+
+    /* Jump to the bootsector code */
+    ljmp16	HEX(0000), HEX(7C00)

reactos/boot/freeldr/freeldr/arch/realmode/i386.S

@@ -121,10 +121,13 @@ pm_offset:
     .word 0 // receives address of PE entry point
     .word PMODE_CS
     nop
-
+// FIXME: use ljmp16 PMODE_CS:inpmode + hexed 32bit jump
 
 callback_table:
     .word Int386
+    .word SoftReboot
+    .word ChainLoadBiosBootSectorCode
+    .word PxeCallApi
 
 
     /* 16-bit stack pointer */

reactos/boot/freeldr/freeldr/include/arch/pc/x86common.h

@@ -22,13 +22,23 @@
 #define DISKREADBUFFER_SIZE 512
 
 /* These addresses specify the realmode "BSS section" layout */
-#define BSS_RealModeEntry   (BSS_START +  0)
+#define BSS_RealModeEntry    (BSS_START +  0)
-#define BSS_CallbackAddress (BSS_START +  4)
+#define BSS_CallbackAddress  (BSS_START +  4)
-#define BSS_CallbackReturn  (BSS_START +  8)
+#define BSS_CallbackReturn   (BSS_START +  8)
+#define BSS_RegisterSet      (BSS_START + 16) /* size = 36 */
+#define BSS_IntVector        (BSS_START + 52)
+#define BSS_PxeEntryPoint    (BSS_START + 56)
+#define BSS_PxeBufferSegment (BSS_START + 60)
+#define BSS_PxeBufferOffset  (BSS_START + 64)
+#define BSS_PxeFunction      (BSS_START + 68)
+#define BSS_PxeResult        (BSS_START + 72)
 
-#define BSS_RegisterSet     (BSS_START + 16) /* size = 36 */
+
-#define BSS_IntVector       (BSS_START + 52)
+/* Realmode function IDs */
-// next 52
+#define FNID_Int386 0
+#define FNID_SoftReboot 1
+#define FNID_ChainLoadBiosBootSectorCode 2
+#define FNID_PxeCallApi 3
 
 /* Layout of the REGS structure */
 #define REGS_EAX 0