aboutsummaryrefslogtreecommitdiff
path: root/sys
diff options
context:
space:
mode:
Diffstat (limited to 'sys')
-rw-r--r--sys/arch/amd64/amd64/bus_machdep.c74
-rw-r--r--sys/arch/amd64/pci/pci_resource.c159
-rw-r--r--sys/include/arch/amd64/bus.h57
-rw-r--r--sys/include/dev/pci/resource.h51
4 files changed, 341 insertions, 0 deletions
diff --git a/sys/arch/amd64/amd64/bus_machdep.c b/sys/arch/amd64/amd64/bus_machdep.c
index d542821..89ef317 100644
--- a/sys/arch/amd64/amd64/bus_machdep.c
+++ b/sys/arch/amd64/amd64/bus_machdep.c
@@ -34,6 +34,52 @@
#include <vm/vm.h>
#include <vm/map.h>
#include <vm/pmap.h>
+#include <vm/dynalloc.h>
+#include <dev/pci/resource.h>
+#include <string.h>
+
+#define BUS_PCI "PCI"
+#define BUS_LPC "LPC"
+
+/*
+ * Set bus specific fields
+ *
+ * @brp: Bus resource pointer.
+ * @type: Bus name/signature
+ *
+ * XXX: Assumes brp->base has already been set to
+ * a valid bus address.
+ */
+static int
+bus_set(struct bus_resource *brp, const char *type)
+{
+ struct bus_op *io = &brp->io;
+
+ switch (*type) {
+ case 'P':
+ if (strcmp(type, BUS_PCI) == 0) {
+ /*
+ * Bus addresses for 64-bit PCI can theoretically
+ * span 2^64 bytes (i.e., the full 64-bit address space)
+ */
+ brp->dma_max = (bus_addr_t)-1;
+ brp->dma_min = 0;
+
+ /* Set hooks */
+ io->enable_dma = pcir_enable_dma;
+ io->disable_dma = pcir_disable_dma;
+ io->set_sem = pcir_set_sem;
+ io->clr_sem = pcir_clr_sem;
+ io->dma_alloc = pcir_dma_alloc;
+ io->dma_free = pcir_dma_free;
+ io->dma_in = pcir_dma_in;
+ io->dma_out = pcir_dma_out;
+ return 0;
+ }
+ }
+
+ return -ENODEV;
+}
/*
* Map a physical device address into the kernel address
@@ -78,3 +124,31 @@ bus_map(bus_addr_t addr, size_t size, int flags, void **vap)
*vap = (void *)va;
return 0;
}
+
+/*
+ * Associate a specific bus with a 'bus_resource`
+ * structure.
+ *
+ * @name: Signature.
+ */
+struct bus_resource *
+bus_establish(const char *name)
+{
+ struct bus_resource *brp;
+ size_t siglen;
+
+ siglen = strlen(name);
+ if (siglen > RSIG_MAX) {
+ return NULL;
+ }
+
+ /* Allocate a new bus resource handle */
+ if ((brp = dynalloc(sizeof(*brp))) == NULL) {
+ return NULL;
+ }
+
+ memset(brp, 0, sizeof(*brp));
+ memcpy(brp->signature, name, siglen);
+ bus_set(brp, name);
+ return brp;
+}
diff --git a/sys/arch/amd64/pci/pci_resource.c b/sys/arch/amd64/pci/pci_resource.c
new file mode 100644
index 0000000..5ca597b
--- /dev/null
+++ b/sys/arch/amd64/pci/pci_resource.c
@@ -0,0 +1,159 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/errno.h>
+#include <sys/syslog.h>
+#include <dev/pci/resource.h>
+#include <dev/pci/pci.h>
+#include <dev/pci/pciregs.h>
+
+// #define DEBUG 1
+
+#define pr_trace(fmt, ...) kprintf("pci: " fmt, ##__VA_ARGS__)
+#define pr_error(...) pr_trace(__VA_ARGS__)
+
+#if defined(DEBUG)
+#define pr_debug(...) pr_trace(__VA_ARGS__)
+#else
+#define pr_debug(...) __nothing
+#endif
+
+/*
+ * Enables bus mastering for a specific PCI device.
+ *
+ * @brp: Pointer to bus resource handle.
+ * @devp: Pointer to `pci_device' structure.
+ *
+ * XXX: If the bus resource is MMIO capable, PCI
+ * memory space access will become set within
+ * the command/status register
+ */
+int
+pcir_enable_dma(struct bus_resource *brp, void *devp)
+{
+ struct pci_device *dev = devp;
+ uint32_t tmp;
+
+ if (brp == NULL || dev == NULL) {
+ return -EINVAL;
+ }
+
+ /*
+ * Make sure that we are allowed to perform DMA. This
+ * will fail if the bus isn't DMA-capable or if DMA
+ * is disabled.
+ */
+ if (!ISSET(brp->sem, BUS_DMA)) {
+ pr_trace("Bus marked non DMA capable, DMA not enabled\n");
+ return -EACCES;
+ }
+
+ tmp = pci_readl(dev, PCIREG_CMDSTATUS);
+ tmp |= PCI_BUS_MASTERING;
+ tmp |= ISSET(brp->sem, BUS_MMIO);
+ pci_writel(dev, PCIREG_CMDSTATUS, tmp);
+ return 0;
+}
+
+/*
+ * Disables bus mastering for a specific PCI device.
+ *
+ * @brp: Pointer to bus resource handle.
+ * @devp: Pointer to `pci_device' structure.
+ *
+ * XXX: If the bus resource is not MMIO capable, PCI
+ * memory space access will become unset within
+ * the command/status register
+ */
+int
+pcir_disable_dma(struct bus_resource *brp, void *devp)
+{
+ struct pci_device *dev = devp;
+ uint32_t tmp;
+
+ if (brp == NULL || dev == NULL) {
+ return -EINVAL;
+ }
+
+ tmp = pci_readl(dev, PCIREG_CMDSTATUS);
+ tmp &= ~PCI_BUS_MASTERING;
+ tmp &= ~ISSET(brp->sem, BUS_MMIO);
+ pci_writel(dev, PCIREG_CMDSTATUS, tmp);
+ return 0;
+}
+
+int
+pcir_set_sem(struct bus_resource *brp, bus_sem_t sem)
+{
+ /*
+ * BUS_PIO and BUS_MMIO are two different things
+ * and must be mutually exclusive...
+ */
+ if (ISSET(sem, BUS_MMIO) && ISSET(sem, BUS_PIO)) {
+ pr_debug("Bad semantics (sem=%x)\n", sem);
+ return -EINVAL;
+ }
+
+ brp->sem |= sem;
+ return 0;
+}
+
+int
+pcir_clr_sem(struct bus_resource *brp, bus_sem_t sem)
+{
+ brp->sem &= ~sem;
+ return 0;
+}
+
+__unused int
+pcir_dma_alloc(struct bus_resource *brp, void *res)
+{
+ return 0;
+}
+
+__unused int
+pcir_dma_free(struct bus_resource *brp, void *p)
+{
+ return 0;
+}
+
+ssize_t
+pcir_dma_in(struct bus_resource *brp, void *p)
+{
+ return 0;
+}
+
+ssize_t
+pcir_dma_out(struct bus_resource *brp, void *p)
+{
+ return 0;
+}
diff --git a/sys/include/arch/amd64/bus.h b/sys/include/arch/amd64/bus.h
index c99d13f..00cb3ba 100644
--- a/sys/include/arch/amd64/bus.h
+++ b/sys/include/arch/amd64/bus.h
@@ -31,6 +31,10 @@
#define _MACHINE_BUS_H_
#include <sys/types.h>
+#include <sys/spinlock.h>
+#include <sys/param.h>
+
+struct bus_resource;
/*
* Hyra assumes that the bootloader uses PDE[256] for some
@@ -40,8 +44,61 @@
*/
#define MMIO_OFFSET (VM_HIGHER_HALF + 0x8000000000)
+/* Resource signature size max */
+#define RSIG_MAX 16
+
+/*
+ * Basic bus resource semantics
+ *
+ * BUS_PIO: If set, this resource uses port I/O
+ * BUS_MMIO: If set, this resource uses memory-mapped I/O
+ * BUS_WRITABLE: If unset, this resource is read-only
+ * BUS_DMA: If set, this resource is DMA-capable
+ */
+#define BUS_PIO BIT(0)
+#define BUS_MMIO BIT(1)
+#define BUS_WRITABLE BIT(2)
+#define BUS_DMA BIT(3)
+
+/*
+ * Common bus types.
+ *
+ * bus_addr_t: Physical MMIO address
+ * bus_sem_t: Resource semantics
+ */
typedef uint64_t bus_addr_t;
+typedef uint64_t bus_sem_t;
+
+struct bus_op {
+ /* Enable/disable DMA */
+ int(*enable_dma)(struct bus_resource *brp, void *arg);
+ int(*disable_dma)(struct bus_resource *brp, void *arg);
+
+ /* Set/unset flags */
+ int(*set_sem)(struct bus_resource *brp, bus_sem_t sem);
+ int(*clr_sem)(struct bus_resource *brp, bus_sem_t sem);
+
+ /* DMA buffer related operations */
+ int(*dma_alloc)(struct bus_resource *brp, void *res);
+ int(*dma_free)(struct bus_resource *brp, void *p);
+
+ /* DMA transfer related operations */
+ ssize_t(*dma_in)(struct bus_resource *brp, void *p);
+ ssize_t(*dma_out)(struct bus_resource *brp, void *p);
+};
+
+struct bus_resource {
+ char signature[RSIG_MAX]; /* e.g., "PCI\0", "ISA\0", "LPC\0", etc */
+ off_t align; /* Alignment required (0: none) */
+ bus_addr_t dma_max; /* Maximum address possible for DMA */
+ bus_addr_t dma_min; /* Minimum address possible for DMA */
+ bus_addr_t base; /* Resource base [physical] address */
+ bus_sem_t sem; /* Resource semantics */
+ struct bus_op io; /* I/O operations */
+ struct spinlock lock; /* Protects this structure */
+};
int bus_map(bus_addr_t addr, size_t size, int flags, void **vap);
+struct bus_resource *bus_establish(const char *name);
#endif /* !_MACHINE_BUS_H_ */
diff --git a/sys/include/dev/pci/resource.h b/sys/include/dev/pci/resource.h
new file mode 100644
index 0000000..b469e8f
--- /dev/null
+++ b/sys/include/dev/pci/resource.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _PCI_RESOURCE_H_
+#define _PCI_RESOURCE_H_
+
+#include <machine/bus.h>
+
+/* Enable/disable DMA (bus mastering in this case) */
+int pcir_enable_dma(struct bus_resource *brp, void *devp);
+int pcir_disable_dma(struct bus_resource *brp, void *devp);
+
+/* Set/unset bus resource semantics */
+int pcir_set_sem(struct bus_resource *brp, bus_sem_t sem);
+int pcir_clr_sem(struct bus_resource *brp, bus_sem_t sem);
+
+/* DMA buffer helpers (XXX: unused for now) */
+int pcir_dma_alloc(struct bus_resource *brp, void *res);
+int pcir_dma_free(struct bus_resource *brp, void *p);
+
+/* DMA transaction helpers (XXX: unused for now) */
+ssize_t pcir_dma_in(struct bus_resource *brp, void *p);
+ssize_t pcir_dma_out(struct bus_resource *brp, void *p);
+
+#endif /* !_PCI_RESOURCE_H_ */
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-23 23:24:42 +0000