mirror of
https://github.com/curioustorvald/tsvm.git
synced 2026-03-07 19:51:51 +09:00
231 lines
6.8 KiB
Plaintext
231 lines
6.8 KiB
Plaintext
1 byte = 2 pixels
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560x448@4bpp = 125 440 bytes
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560x448@8bpp = 250 880 bytes
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-> 262144 bytes (256 kB)
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[USER AREA | HW AREA]
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Number of pheripherals = 8, of which the computer itself is considered as
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a peripheral.
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HW AREA = [Peripherals | MMIO | INTVEC]
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User area: 8 MB, hardware area: 8 MB
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8192 kB
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User Space
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1024 kB
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Peripheral #8
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1024 kB
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Peripheral #7
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...
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1024 kB (where Peripheral #0 would be)
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MMIO and Interrupt Vectors
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128 kB
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MMIO for Peri #8
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128 kB
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MMIO for Peri #7
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...
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128 kB (where Peripheral #0 would be)
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MMIO for the computer
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130816 bytes
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MMIO for Ports, etc.
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256 bytes
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Vectors for 64 interrupts
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--------------------------------------------------------------------------------
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IO Device
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Endianness: little
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Note: Always takes up the peripheral slot of zero
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Latching: latching is used to "lock" the fluctuating values when you attempt to read them so you would get
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reliable values when you try to read them, especially the multibyte values where another byte would
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change after you read one byte, e.g. System uptime in nanoseconds
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MMIO
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0..31 RO: Raw Keyboard Buffer read. Won't shift the key buffer
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32..33 RO: Mouse X pos
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34..35 RO: Mouse Y pos
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36 RO: Mouse down? (1 for TRUE, 0 for FALSE)
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37 RW: Read/Write single key input. Key buffer will be shifted. Manual writing is
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usually unnecessary as such action must be automatically managed via LibGDX
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input processing.
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Stores ASCII code representing the character, plus:
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(1..26: Ctrl+[alph])
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3 : Ctrl+C
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4 : Ctrl+D
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8 : Backspace
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(13: Return)
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19: Up arrow
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20: Down arrow
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21: Left arrow
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22: Right arrow
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38 RW: Request keyboard input be read (TTY Function). Write nonzero value to enable, write zero to
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close it. Keyboard buffer will be cleared whenever request is received, so
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MAKE SURE YOU REQUEST THE KEY INPUT ONLY ONCE!
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39 WO: Latch Key/Mouse Input (Raw Input function). Write nonzero value to latch.
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Stores LibGDX Key code
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40..47 RO: Key Press buffer
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stores keys that are held down. Can accomodate 8-key rollover (in keyboard geeks' terms)
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0x0 is written for the empty area; numbers are always sorted
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64..67 RO: User area memory size in bytes
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68 WO: Counter latch
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0b 0000 00ba
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a: System uptime
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b: RTC
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72..79 RO: System uptime in nanoseconds
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80..87 RO: RTC in microseconds
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88 RW: Rom mapping
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89 RO: BMS flags
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0b b000 00ca
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a: 1 if charging (accepting power from the AC adapter)
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c: 1 if battery is detected
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b: 1 if the device is battery-operated
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if the device is battery-operated but currently running off of an AC adapter and there is no battery inserted,
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the flag would be 1000 0001
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90 RO: BMS calculated battery percentage where 255 is 100%
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91 RO: BMS battery voltage multiplied by 10 (127 = "12.7 V")
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4076..4079 RW: 8-bit status code for the port
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4080..4083 RO: 8-bit status code for connected device
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4084..4091 RO: Block transfer status
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0b nnnnnnnn a000 mmmm
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n-read: size of the block from the other device, LSB (4096-full block size is zero)
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m-read: size of the block from the other device, MSB (4096-full block size is zero)
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a-read: if the other device hasNext (doYouHaveNext), false if device not present
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n-write: size of the block I'm sending, LSB (4096-full block size is zero)
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m-write: size of the block I'm sending, MSB (4096-full block size is zero)
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a-write: if there's more to send (hasNext)
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4092..4095 RW: Block transfer control for Port 1 through 4
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0b 00ms abcd
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m-readonly: device in master setup
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s-readonly: device in slave setup
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a: 1 for send, 0 for receive
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b-write: 1 to start sending if a-bit is set; if a-bit is unset, make other device to start sending
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b-read: if this bit is set, you're currently receiving something (aka busy)
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c-write: I'm ready to receive
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c-read: Are you ready to receive?
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d-read: Are you there? (if the other device's recipient is myself)
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NOTE: not ready AND not busy (bits b and d set when read) means the device is not connected to the port
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4096..8191 RW: Buffer for block transfer lane #1
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8192..12287 RW: Buffer for block transfer lane #2
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12288..16383 RW: Buffer for block transfer lane #3
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16384..20479 RW: Buffer for block transfer lane #4
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65536..131071 RO: Mapped to ROM
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--------------------------------------------------------------------------------
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VRAM Bank 0 (256 kB)
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Endianness: little
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From the start of the memory space:
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250880 bytes
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Framebuffer
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3 bytes
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Initial background (and the border) colour RGB, of which only the lower 4 bits per each channel are used
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1 byte
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command (writing to this memory address changes the status)
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1: reset palette to default
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2: fill framebuffer with given colour (arg1)
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2 bytes
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argument for "command" (arg1: Byte, arg2: Byte)
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write to this address FIRST and then write to "command" to execute the command
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76 bytes
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*Unused*
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2988 bytes
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DMA Sprite Area - 18 bytes each, total of 166 sprites
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1 byte
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Sprite width
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1 byte
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Sprite height
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12 bytes - signed fixed point
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Affine transformation A,B,C,D,X,Y
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1 byte
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Attributes
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0b 0000 00vp
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(p: 0 for above-all, 1 for below-text, v: show/hide)
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3 bytes
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Pointer to raw pixmap data in Scratchpad Memory
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2 bytes
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Cursor position in: (y*32 + x)
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2560 bytes
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Text foreground colours
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2560 bytes
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Text background colours
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2560 bytes
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Text buffer of 80x32 (7x14 character size, and yes: actual character data is on the bottom)
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FI
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512 bytes
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Palette stored in following pattern: 0b rrrr gggg, 0b bbbb aaaa, ....
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Palette number 255 is always full transparent (bits being all zero)
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(DRAFT) Optional Sprite Card (VRAM Bank 1 (256 kB))
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250880 bytes
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Secondary framebuffer
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533 bytes: Sprite attribute table
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(41 sprites total, of which 1 is GUI cursor)
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12 bytes - signed fixed point
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X-position
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Y-position
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Transform matrix A..D
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1 bytes
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0b 0000 00vp
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(p: 0 for above-all, 1 for below-text, v: show/hide)
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10496 bytes: Sprite table
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256 bytes
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16x16 texture for the sprite
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235 bytes:
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unused
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MMIO
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0..1 RO
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Framebuffer width in pixels
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2..3 RO
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Framebuffer height in pixels
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4 RO
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Text mode columns
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5 RO
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Text mode rows
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6 RW
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Text-mode attributes
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0b kkkk 00rc (k: currently using character rom, r: TTY Raw mode, c: Cursor blink)
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7 RW
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Graphics-mode attributes
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0b 0000 000g (g: Use sprites(wipes out text buffer))
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8 RO
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Last used colour (set by poking at the framebuffer)
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9 RW
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current TTY foreground colour (useful for print() function)
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10 RW
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current TTY background colour (useful for print() function)
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Text-mode-font-ROM is immutable and does not belong to VRAM
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Even in the text mode framebuffer is still being drawn onto the screen, and the texts are drawn on top of it |