-/* We have an RTC - well maybe (its optional) */
-#define CONFIG_RTC
-#define CONFIG_RTC_FULL
-#define CONFIG_NO_CLOCK
/* Enable to make ^Z dump the inode table for debug */
#undef CONFIG_IDUMP
/* Enable to make ^A drop back into the monitor */
#define CONFIG_MULTI
/* Single tasking */
#undef CONFIG_SINGLETASK
-/* Banked memory set up */
+
+/* Select a banked memory set up */
#define CONFIG_BANK_FIXED
+/* This is the number of banks of user memory available (maximum) */
#define MAX_MAPS 15 /* 512 KByte... minus the high one */
+/* How big is each bank - in our case 32K, 48K is actually more common. This
+ is hardware dependant */
#define MAP_SIZE 0x8000
+/* How many banks do we have in our address space */
+#define CONFIG_BANKS 2 /* 2 x 32K */
+
+/*
+ * Define the program loading area (needs to match kernel.def)
+ */
+#define PROGBASE 0x0000 /* Base of user */
+#define PROGLOAD 0x0100 /* Load and run here */
+#define PROGTOP 0x7E00 /* Top of program, base of U_DATA stash */
+#define PROC_SIZE 32 /* Memory needed per process including stash */
+/*
+ * Definitions for swapping.
+ */
+#define SWAPDEV (swap_dev) /* A variable for dynamic, or a device major/minor */
+extern unsigned int swap_dev;
+#define SWAP_SIZE 0x40 /* 32K in 512 byte blocks */
+#define SWAPBASE 0x0000 /* We swap the lot in one, include the */
+#define SWAPTOP 0x8000 /* vectors so its a round number of sectors */
+
+#define MAX_SWAPS 16 /* Maximum number of swapped out processes.
+ As we use the default 15 process max this
+ is definitely sufficient (14 would do) */
+/*
+ * When the kernel swaps something it needs to map the right page into
+ * memory using map_for_swap and then turn the user address into a
+ * physical address. For a simple banked setup there is no conversion
+ * needed so identity map it.
+ */
+#define swap_map(x) ((uint8_t *)(x))
/* Set these two for networking - no point right now */
//#define CONFIG_NET
//#define CONFIG_NET_NATIVE
-/* PPIDE is present */
+
+/* What is the maximum number of /dev/hd devices we have. In theory right now
+ it's actually 3 - two in the IDE and one on the SD interface */
+#define MAX_BLKDEV 4
+/* Select IDE disk support, and PPIDE (parallel port IDE) as the interface */
#define CONFIG_IDE
-#define CONFIG_PPIDE
+#define CONFIG_PPIDE /* PPIDE is present */
+
/* Floppy controller does not do high density. Well it does but we can't keep
up at 4MHz so default to 720K media for now */
#define CONFIG_FLOPPY_NOHD
+/* We will resize the buffers available after boot. This is the normal setting */
#define CONFIG_DYNAMIC_BUFPOOL
+/* Swap will be set up when a suitably labelled partition is seen */
#define CONFIG_DYNAMIC_SWAP
+/* Larger transfers (including process execution) should go directly not via
+ the buffer cache. For all small (eg bit) systems this is the right setting
+ as it avoids polluting the small cache with data when it needs to be full
+ of directory and inode information */
#define CONFIG_LARGE_IO_DIRECT
-#define MAX_BLKDEV 4
-
-#define CONFIG_BANKS 2 /* 2 x 32K */
-
+/* Specify this if there is a real time clock capable of reporting seconds. It
+ will be used to lock the kernel time better to reality. Other details like
+ Y2K support, or even supporting dates as well don't matter */
+#define CONFIG_RTC
+/* Specify that there is a full real time clock that can supply the date and
+ time to the system. */
+#define CONFIG_RTC_FULL
+/* Set this if the system has no proper real time clock (or has configurations
+ where it lacks one). This is not usually needed but for platforms it is also
+ see platform-sbcv2/main.c on what is needed */
+#define CONFIG_NO_CLOCK
+/*
+ * How fast does the clock tick (if present), or how many times a second do
+ * we simulate if not. For a machine without video 10 is a good number. If
+ * you have video you probably want whatever vertical sync/blank interrupt
+ * rate the machine has. For many systems it's whatever the hardware gives
+ * you.
+ *
+ * Note that this needs to be divisible by 10 and at least 10. If your clock
+ * is a bit slower you may need to fudge things somewhat so that the kernel
+ * gets 10 timer interrupt calls per second.
+ */
#define TICKSPERSEC 10 /* Ticks per second */
-#define PROGBASE 0x0000 /* Base of user */
-#define PROGLOAD 0x0100 /* Load and run here */
-#define PROGTOP 0x7E00 /* Top of program, base of U_DATA stash */
-#define PROC_SIZE 32 /* Memory needed per process */
-
-#define SWAPDEV (swap_dev)
-#define SWAP_SIZE 0x40 /* 32K in blocks */
-#define SWAPBASE 0x0000 /* We swap the lot in one, include the */
-#define SWAPTOP 0x8000 /* vectors so its a round number of sectors */
-
-#define MAX_SWAPS 16 /* Should be plenty */
-
-#define swap_map(x) ((uint8_t *)(x))
+/*
+ * The device (major/minor) for the console and boot up tty attached to
+ * init at start up. 512 is the major 2, so all the tty devices are
+ * 512 + n where n is the tty.
+ */
#define BOOT_TTY (512 + 1) /* Set this to default device for stdio, stderr */
/* In this case, the default is the first TTY device */
-
-/* We need a tidier way to do this from the loader */
+/*
+ * If you have a mechanism to pass in a root device configuration then
+ * this holds the address of the buffer (eg a CP/M command line or similar).
+ * If the configuration is fixed then this can be a string holding the
+ * configuration. NULL means 'prompt the user'.
+ */
#define CMDLINE NULL /* Location of root dev name */
/* Device parameters */
-#define NUM_DEV_TTY 2
+#define NUM_DEV_TTY 2 /* How many tty devices does the platform support */
#define TTYDEV BOOT_TTY /* Device used by kernel for messages, panics */
-#define NBUFS 5 /* Number of block buffers */
+#define NBUFS 5 /* Number of block buffers. Must be 4+ and must match
+ kernel.def */
#define NMOUNTS 4 /* Number of mounts at a time */
+/* This can optionally be set to force a default baud rate, eg if the system
+ console should match a firmware set rate */
#define TTY_INIT_BAUD B38400 /* To match ROMWBW */
-extern unsigned int swap_dev;
-; FUZIX mnemonics for memory addresses etc
-
+; FUZIX mnemonics for memory addresses etc
+;
+;
+; The U_DATA address. If we are doing a normal build this is the start
+; of common memory. We do actually have a symbol for udata so
+; eventually this needs to go away
+;
U_DATA .equ 0xF000 ; (this is struct u_data from kernel.h)
U_DATA__TOTALSIZE .equ 0x200 ; 256+256 bytes)
-
+;
+; Space for the udata of a switched out process within the bank of
+; memory that it uses. Normally placed at the very top
+;
U_DATA_STASH .equ 0x7E00 ; 7E00-7FFF
-
+;
+; Z80 systems start program space at 0, and load at 0x100 so that the
+; low 256 bytes are free for syscall vectors and the like, with some
+; also used as a special case by the CP/M emulator.
+;
PROGBASE .equ 0x0000
PROGLOAD .equ 0x0100
-
+;
+; CPU type
+; 0 = CMOS Z80
+; 1 = NMOS Z80 (also works with CMOS)
+; 2 = Z180
+;
+; If either NMOS or CMOS may be present pick NMOS as the NMOS build
+; contains extra code to work around an erratum n the NUMS Z80
+;
Z80_TYPE .equ 1 ; NMOS (IRQ bugs) Z80
-
+;
+; For special platforms that have external memory protectuon hardware
+; Just say 0.
+;
Z80_MMU_HOOKS .equ 0
-
+;
+; Set this if the platform has swap enabled in config.h
+;
CONFIG_SWAP .equ 1
-
+;
+; The number of disk buffers. Must match config.h
+;
NBUFS .equ 5
-
+;
+; Configuration for the Zeta floppy controller. Specific to that
+; driver rather than generic.
+;
; FDC9266 floppy controller ports
FDC_CCR .equ 0 ; No CCR
FDC_MSR .equ 0x36 ; 8272 Main Status Register (R/O)
public / FUZIX.git / commitdiff