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XHCI: allocate scratchpad buffers

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This commit is contained in:
Josh Holtrop 2025-05-23 10:13:54 -04:00
parent ea159db100
commit 0d970a6d25
1 changed files with 24 additions and 14 deletions
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38
src/hulk/usb/xhci.d
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@ -47,6 +47,11 @@ struct XHCI
*/
Volatile!uint hcs_params1;
@property ubyte max_slots()
{
return this.hcs_params1 & 0xFFu;
}
/**
* 3:0 isochronous scheduling threshold (IST)
* 7:4 event ring segment table max (ERST Max)
@ -57,6 +62,12 @@ struct XHCI
*/
Volatile!uint hcs_params2;
@property size_t max_scratchpad_buffers()
{
uint v = this.hcs_params2;
return (v >> 27u) | ((v >> (21 - 5)) & 0x3E0u);
}
/**
* 7:0 U1 device exit latency
* 15:8 reserved
@ -118,11 +129,6 @@ struct XHCI
* 31:12 VTIO register space offset (xHCI v1.2+)
*/
Volatile!uint vtios_offset;
@property ubyte max_slots()
{
return this.hcs_params1 & 0xFFu;
}
}
static assert(CapabilityRegisters.sizeof == 0x24u);
@ -370,17 +376,14 @@ struct XHCI
ubyte * page = cast(ubyte *)Hippo.allocate_page();
/* Device Context Index: 2K */
void ** device_context_index = cast(void **)page;
page = cast(ubyte *)Hippo.allocate_page();
/* Input Control Context: 64 bytes */
void * input_control_context = page;
void * input_control_context = &page[2048];
/* Slot Context: 64 bytes */
void * slot_context = &page[64];
void * slot_context = &page[2048 + 64];
/* Endpoint Context: 64 bytes */
void * endpoint_context = &page[128];
void * endpoint_context = &page[2048 + 64 + 64];
/* Stream Context: 16 bytes */
void * stream_context = &page[192];
/* Scratchpad Buffer Array: 248 bytes */
void ** scratchpad_buffer_array = cast(void **)&page[256];
void * stream_context = &page[2048 + 64 + 64 + 64];
/* Stream Array (Linear): 1M */
void * stream_array_linear = Hippo.allocate_aligned_region(1024 * 1024, PAGE_SIZE);
/* Stream Array (Pri/Sec): 4K */
@ -393,8 +396,15 @@ struct XHCI
void * event_ring_segments = Hippo.allocate_aligned_region(64 * 1024, 64 * 1024);
/* Event Ring Segment Table: 512K */
void * event_ring_segment_table = Hippo.allocate_aligned_region(512 * 1024, PAGE_SIZE);
/* Scratchpad Buffers: 4K */
void * scratchpad_buffers = Hippo.allocate_page();
/* Scratchpad Buffer Array: 248 bytes */
void ** scratchpad_buffer_array = cast(void **)Hippo.allocate_aligned_region(2 * PAGE_SIZE, PAGE_SIZE);
size_t n_scratchpad_buffers = m_capability_registers.max_scratchpad_buffers;
for (size_t i = 0u; i < n_scratchpad_buffers; i++)
{
void * scratchpad_buffer = Hippo.allocate_page();
scratchpad_buffer_array[i] = scratchpad_buffer;
}
device_context_index[0] = scratchpad_buffer_array;