Rename OPT_CONTWRAM to OPT_DMG_MODE

Now, it will also make sure that VRAM bank 1 isn't used.

Man page updated.

Tests added.

Signed-off-by: Antonio Niño Díaz <antonio_nd@outlook.com>

include/link/mylink.h

@@ -11,7 +11,7 @@ extern SLONG options;
 #define OPT_TINY		0x01
 #define OPT_SMART_C_LINK	0x02
 #define OPT_OVERLAY		0x04
-#define OPT_CONTWRAM		0x08
+#define OPT_DMG_MODE		0x08
 
 enum eRpnData {
 	RPN_ADD = 0,

src/link/assign.c

@@ -402,7 +402,7 @@ AssignSections(void)
 		} else if (i == BANK_WRAM0) {
 			/* WRAM */
 			BankFree[i]->nOrg = 0xC000;
-			if (options & OPT_CONTWRAM) {
+			if (options & OPT_DMG_MODE) {
 				BankFree[i]->nSize = 0x2000;
 			} else {
 				BankFree[i]->nSize = 0x1000;
@@ -418,7 +418,11 @@ AssignSections(void)
 		} else if (i >= BANK_VRAM && i < BANK_VRAM + BANK_COUNT_VRAM) {
 			/* Swappable VRAM bank */
 			BankFree[i]->nOrg = 0x8000;
-			BankFree[i]->nSize = 0x2000;
+			if (options & OPT_DMG_MODE && i != BANK_VRAM) {
+				BankFree[i]->nSize = 0;
+			} else {
+				BankFree[i]->nSize = 0x2000;
+			}
 		} else if (i == BANK_OAM) {
 			BankFree[i]->nOrg = 0xFE00;
 			BankFree[i]->nSize = 0x00A0;

src/link/main.c

@@ -92,10 +92,14 @@ main(int argc, char *argv[])
 			options |= OPT_TINY;
 			break;
 		case 'w':
-			/* Set to set WRAM as a single continuous block as on DMG.
-			All WRAM sections must be WRAM0 as bankable WRAM sections do
-			not exist in this mode. A WRAMX section will raise an error. */
-			options |= OPT_CONTWRAM;
+			/*
+			 * Set to set WRAM as a single continuous block as on
+			 * DMG. All WRAM sections must be WRAM0 as bankable WRAM
+			 * sections do not exist in this mode. A WRAMX section
+			 * will raise an error. VRAM bank 1 can't be used if
+			 * this option is enabled either.
+			 */
+			options |= OPT_DMG_MODE;
 			break;
 		default:
 			usage();

src/link/object.c

@@ -159,8 +159,13 @@ obj_ReadRGBSection(FILE * f)
 	if ((options & OPT_TINY) && (pSection->Type == SECT_ROMX)) {
 		errx(1,  "ROMX sections can't be used with option -t.");
 	}
-	if ((options & OPT_CONTWRAM) && (pSection->Type == SECT_WRAMX)) {
-		errx(1, "WRAMX sections can't be used with option -w.");
+	if (options & OPT_DMG_MODE) {
+		if (pSection->Type == SECT_WRAMX) {
+			errx(1, "WRAMX sections can't be used with option -w.");
+		}
+		if (pSection->Type == SECT_VRAM && pSection->nBank == 1) {
+			errx(1, "VRAM bank 1 can't be used with option -w.");
+		}
 	}
 
 	if ((pSection->Type == SECT_ROMX) || (pSection->Type == SECT_ROM0)) {

src/link/rgblink.1

@@ -12,7 +12,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd March 27, 2017
+.Dd April 8, 2017
 .Dt RGBLINK 1
 .Os RGBDS Manual
 .Sh NAME
@@ -48,6 +48,7 @@ sections are placed in any bank except bank 0.
 If your ROM is designed for DMG, you can use the
 .Fl w
 option to override this.
+It will also prohibit the use of VRAM bank 1.
 .Pp
 The arguments are as follows:
 .Bl -tag -width Ds
@@ -67,8 +68,10 @@ The default is 0x00.
 .It Fl s Ar symbol
 ???
 .It Fl w
+Enable DMG mode.
 Expand the WRAM0 section size from 4KiB to the full 8KiB assigned to WRAM and
 prohibit the use of WRAMX sections.
+Prohibit the use of VRAM bank 1.
 Useful for ROMs designed for DMG.
 .It Fl t
 Expand the ROM0 section size from 16KiB to the full 32KiB assigned to ROM and

src/link/script.c

@@ -49,7 +49,7 @@ void script_InitSections(void)
 		} else if (i == BANK_WRAM0) {
 			/* WRAM */
 			bank[i].address = 0xC000;
-			if (options & OPT_CONTWRAM) {
+			if (options & OPT_DMG_MODE) {
 				bank[i].top_address = 0xE000;
 			} else {
 				bank[i].top_address = 0xD000;
@@ -68,8 +68,13 @@ void script_InitSections(void)
 		} else if (i >= BANK_VRAM && i < BANK_VRAM + BANK_COUNT_VRAM) {
 			/* Swappable VRAM bank */
 			bank[i].address = 0x8000;
-			bank[i].top_address = 0xA000;
 			bank[i].type = SECT_VRAM;
+			if (options & OPT_DMG_MODE && i != BANK_VRAM) {
+				/* In DMG the only available bank is bank 0. */
+				bank[i].top_address = 0x8000;
+			} else {
+				bank[i].top_address = 0xA000;
+			}
 		} else if (i == BANK_OAM) {
 			/* OAM */
 			bank[i].address = 0xFE00;

test/link/test.sh

@@ -12,11 +12,23 @@ diff bank-numbers.out $outtemp
 head -c 20 $gbtemp > $otemp 2>&1
 diff bank-numbers.out.bin $otemp
 
-$RGBASM -o $otemp wramx-contwram.asm
+$RGBASM -o $otemp wramx-dmg-mode.asm
 $RGBLINK -o $gbtemp $otemp > $outtemp 2>&1
-diff wramx-contwram-no-w.out $outtemp
+diff wramx-dmg-mode-no-w.out $outtemp
 $RGBLINK -w -o $gbtemp $otemp > $outtemp 2>&1
-diff wramx-contwram-w.out $outtemp
+diff wramx-dmg-mode-w.out $outtemp
+
+$RGBASM -o $otemp vram-fixed-dmg-mode.asm
+$RGBLINK -o $gbtemp $otemp > $outtemp 2>&1
+diff vram-fixed-dmg-mode-no-w.out $outtemp
+$RGBLINK -w -o $gbtemp $otemp > $outtemp 2>&1
+diff vram-fixed-dmg-mode-w.out $outtemp
+
+$RGBASM -o $otemp vram-floating-dmg-mode.asm
+$RGBLINK -o $gbtemp $otemp > $outtemp 2>&1
+diff vram-floating-dmg-mode-no-w.out $outtemp
+$RGBLINK -w -o $gbtemp $otemp > $outtemp 2>&1
+diff vram-floating-dmg-mode-w.out $outtemp
 
 $RGBASM -o $otemp romx-tiny.asm
 $RGBLINK -o $gbtemp $otemp > $outtemp 2>&1

test/link/update-refs.sh

@@ -8,9 +8,17 @@ $RGBASM -o $otemp bank-numbers.asm
 $RGBLINK -o $gbtemp $otemp > bank-numbers.out 2>&1
 head -c 20 $gbtemp > bank-numbers.out.bin 2>&1
 
-$RGBASM -o $otemp wramx-contwram.asm
-$RGBLINK -o $gbtemp $otemp > wramx-contwram-no-w.out 2>&1
-$RGBLINK -w -o $gbtemp $otemp > wramx-contwram-w.out 2>&1
+$RGBASM -o $otemp wramx-dmg-mode.asm
+$RGBLINK -o $gbtemp $otemp > wramx-dmg-mode-no-w.out 2>&1
+$RGBLINK -w -o $gbtemp $otemp > wramx-dmg-mode-w.out 2>&1
+
+$RGBASM -o $otemp vram-fixed-dmg-mode.asm
+$RGBLINK -o $gbtemp $otemp > vram-fixed-dmg-mode-no-w.out 2>&1
+$RGBLINK -w -o $gbtemp $otemp > vram-fixed-dmg-mode-w.out 2>&1
+
+$RGBASM -o $otemp vram-floating-dmg-mode.asm
+$RGBLINK -o $gbtemp $otemp > vram-floating-dmg-mode-no-w.out 2>&1
+$RGBLINK -w -o $gbtemp $otemp > vram-floating-dmg-mode-w.out 2>&1
 
 $RGBASM -o $otemp romx-tiny.asm
 $RGBLINK -o $gbtemp $otemp > romx-tiny-no-t.out 2>&1

test/link/vram-fixed-dmg-mode-w.out

@@ -0,0 +1 @@
+rgblink: error: VRAM bank 1 can't be used with option -w.

test/link/vram-fixed-dmg-mode.asm

@@ -0,0 +1,6 @@
+SECTION "v0", VRAM, BANK[0]
+DS $2000
+
+SECTION "v1", VRAM, BANK[1]
+DS $2000
+

test/link/vram-floating-dmg-mode-w.out

@@ -0,0 +1 @@
+rgblink: error: Unable to place 'v1' (VRAM section) in any bank

test/link/vram-floating-dmg-mode.asm

@@ -0,0 +1,6 @@
+SECTION "v0", VRAM
+DS $2000
+
+SECTION "v1", VRAM
+DS $2000
+