paragraph align the values in bss

bochsrc.txt

@@ -1,7 +1,7 @@
 # configuration file generated by Bochs
 plugin_ctrl: voodoo=false, unmapped=true, biosdev=true, speaker=true, extfpuirq=true, parallel=true, serial=true, busmouse=false, e1000=false, es1370=false, gameport=true, ne2k=false, sb16=false, usb_uhci=false, usb_ohci=false, usb_ehci=false, usb_xhci=false
 config_interface: textconfig
-display_library: wx
+display_library: x, options=gui_debug
 memory: guest=64, host=64, block_size=128
 romimage: file="/usr/share/bochs/BIOS-bochs-legacy", address=0x00000000, options=none, flash_data=none
 vgaromimage: file="/usr/share/bochs/VGABIOS-lgpl-latest"
@@ -10,7 +10,7 @@ floppy_bootsig_check: disabled=0
 floppya: type=1_44
 # no floppyb
 ata0: enabled=true, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
-ata0-master: type=disk, path="./disk.img", mode=flat, cylinders=0, heads=0, spt=0, sect_size=512, model="Stevia Disk", biosdetect=auto, translation=lba
+ata0-master: type=disk, path="./build/disk.img", mode=flat, cylinders=0, heads=0, spt=0, sect_size=512, model="Stevia Disk", biosdetect=auto, translation=lba
 ata0-slave: type=none
 ata1: enabled=false
 ata1-master: type=none

include/BIOS/func/E820_memory_map.nasm

@@ -40,23 +40,27 @@ GetMemoryMap:
 .func:
     mov dword [SteviaInfo + SteviaInfoStruct_t.MemoryMapEntries], 0
 
-    mov eax, 0xE820                         ; select 0xE820 function
+    
     xor ebx, ebx                            ; Continuation value, 0 for the first call
 
-    lea dx, [BIOSMemoryMap]
+    mov dx, BIOSMemoryMap
     shr dx, 4
     mov es, dx
     xor di, di                              ; (BIOSMemoryMap >> 4):0 makes di an index into BIOSMemoryMap
 
-    mov ecx, AddressRangeDescStruct_t_size
-    mov edx, 0x534D4150                     ; 'SMAP' magic
+    mov ecx, AddressRangeDescStruct_t_size  ; hard request ACPI 3.0 table versions (24 bytes)
+    
 .loop_L1:
+    mov eax, 0x0000E820                     ; select 0xE820 function
+    mov edx, 0x534D4150                     ; 'SMAP' magic
     int 0x15
     jc GetMemoryMap.error
     cmp eax, 0x534D4150
     jne GetMemoryMap.no_smap_returned
 .no_error:
-    inc dword [SteviaInfo + SteviaInfoStruct_t.MemoryMapEntries]
+    mov eax, dword [SteviaInfo + SteviaInfoStruct_t.MemoryMapEntries]
+    add eax, 1
+    mov dword [SteviaInfo + SteviaInfoStruct_t.MemoryMapEntries], eax
 
     cmp ecx, 20                             ; TODO: maybe this could be handled better than just panicing
     jb GetMemoryMap.nonstandard_e820        ; non-standard entry found 
@@ -64,9 +68,11 @@ GetMemoryMap:
     cmp ebx, 0
     je GetMemoryMap.endp                    ; 0 in ebx means we have reached the end of memory ranges
 
-    add di, AddressRangeDescStruct_t_size   ; increment di to next descriptor
-    mov edx, eax                            ; 'SMAP' to edx
-    mov eax, 0xE820                         ; select E820 function
+    ; setup for next loop, ebx is our next index and has already been set.
+    xor ecx, ecx
+    mov ecx, AddressRangeDescStruct_t_size  ; set ecx (requested_size) to 24 bytes
+    add di, cx                              ; increment di to next descriptor so es:di points to the next free space
+
     jmp GetMemoryMap.loop_L1
 .error:
     ERROR STAGE2_MM_E820_MISC_ERR

src/stage2/stage2.nasm

@@ -504,24 +504,24 @@ section .bss follows=.sign
 begin_bss:
 ; structures
 
-align 8, resb 1
+alignb 16
 partition_table resb PartTable_t_size
 
-align 8, resb 1
+alignb 16
 fat32_bpb resb FAT32_bpb_t_size
 fat32_ebpb resb FAT32_ebpb_t_size
 
-align 8, resb 1
+alignb 16
 fat32_nc_data resb 16
 
-align 8, resb 1
+alignb 16
 lba_packet resb LBAPkt_t_size
 
-align 8, resb 1
+alignb 16
 fat32_state:
     resb FAT32_State_t_size
 
-align 8, resb 1
+alignb 16
 SteviaInfo:
     resd 4
 ;
@@ -531,7 +531,7 @@ SteviaInfo:
 ;
 ; large continuous allocations
 ;
-align 16, resb 1
+alignb 16
 disk_buffer:
     resb 512
 fat_buffer:
@@ -541,12 +541,12 @@ dir_buffer:
 fat_fsinfo:
     resb 512
 
-align 16, resb 1
-%define BIOSMemoryMap_SIZE 2048
+alignb 16
+%define BIOSMemoryMap_SIZE 1024
 BIOSMemoryMap:
-    resb 2048
+    resb BIOSMemoryMap_SIZE
 
-align 512, resb 1
+alignb 512
 stack_bottom:
     resb 1024
 stack_top: