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RichardG867
2022-03-19 15:50:21 -03:00
parent 21227970dc
commit 7ac62f7cdf
6 changed files with 432 additions and 113 deletions
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18
dev/api/io.rst
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@@ -13,20 +13,20 @@ Port I/O
- Description
* - base
- The first I/O port (0x0000-0xFFFF) to be covered by this handler.
- First I/O port (0x0000-0xFFFF) covered by this handler.
* - size
- The amount of I/O ports (1-65536) starting at ``base`` to be covered by this handler.
- Amount of I/O ports (1-65536) covered by this handler, starting at ``base``.
* - inb
- :rspan:`2` I/O read operation callback functions. Can be ``NULL``. Each callback takes the form of:
``TYPE callback(uint16_t addr, void *priv)``
* ``TYPE``: operation width (``uint8_t`` for ``inb``, ``uint16_t`` for ``inw`` or ``uint32_t`` for ``inl``);
* ``TYPE``: operation width: ``uint8_t`` for ``inb``, ``uint16_t`` for ``inw``, ``uint32_t`` for ``inl``;
* ``addr``: exact I/O port being read;
* ``priv``: opaque pointer (see ``priv`` below);
* Return value: value read from this port.
* Return value: 8- (``inb``), 16- (``inw``) or 32-bit (``inl``) value read from this port.
* - inw
@@ -37,9 +37,9 @@ Port I/O
``void callback(uint16_t addr, TYPE val, void *priv)``
* ``TYPE``: operation width (``uint8_t`` for ``outb``, ``uint16_t`` for ``outw`` or ``uint32_t`` for ``outl``);
* ``addr``: exact I/O port being written;
* ``val``: value being written to this port;
* ``TYPE``: operation width: ``uint8_t`` for ``outb``, ``uint16_t`` for ``outw``, ``uint32_t`` for ``outl``;
* ``val``: 8- (``outb``), 16- (``outw``) or 32-bit (``outl``) value being written to this port;
* ``priv``: opaque pointer (see ``priv`` below).
* - outw
@@ -47,8 +47,8 @@ Port I/O
* - outl
* - priv
- Opaque pointer, passed to this handler's read/write operation callbacks.
Usually a pointer to the device's :ref:`state structure <dev/api/device:State structure>`.
- Opaque pointer passed to this handler's read/write operation callbacks.
Usually a pointer to a device's :ref:`state structure <dev/api/device:State structure>`.
I/O handlers can be added or removed at any time, although ``io_removehandler`` must be called with the **exact same** parameters that ``io_sethandler`` was originally called with. For non-Plug and Play devices, you might want to add handlers in the ``init`` callback; for ISA Plug and Play devices, you'd add and/or remove handlers on the ``config_changed`` callback; for PCI devices, you'd do the same whenever the Command register or Base Address (BAR) registers are written to; and so on.
@@ -112,7 +112,7 @@ This feature's main use cases are devices which store registers that are 8-bit w
uint8_t regs[256];
} foo_t;
uint8_t
static uint8_t
foo_inb(uint16_t addr, void *priv)
{
foo_t *dev = (foo_t *) priv;