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Implement hcall based RTAS for pSeries machines
On pSeries machines, operating systems can instantiate "RTAS" (Run-Time Abstraction Services), a runtime component of the firmware which implements a number of low-level, infrequently used operations. On logical partitions under a hypervisor, many of the RTAS functions require hypervisor privilege. For simplicity, therefore, hypervisor systems typically implement the in-partition RTAS as just a tiny wrapper around a hypercall which actually implements the various RTAS functions. This patch implements such a hypercall based RTAS for our emulated pSeries machine. A tiny in-partition "firmware" calls a new hypercall, which looks up available RTAS services in a table. Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Alexander Graf <agraf@suse.de>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| /* | ||
| * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator | ||
| * | ||
| * Hypercall based emulated RTAS | ||
| * | ||
| * Copyright (c) 2010-2011 David Gibson, IBM Corporation. | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| * of this software and associated documentation files (the "Software"), to deal | ||
| * in the Software without restriction, including without limitation the rights | ||
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| * copies of the Software, and to permit persons to whom the Software is | ||
| * furnished to do so, subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in | ||
| * all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | ||
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| * THE SOFTWARE. | ||
| * | ||
| */ | ||
| #include "cpu.h" | ||
| #include "sysemu.h" | ||
| #include "qemu-char.h" | ||
| #include "hw/qdev.h" | ||
| #include "device_tree.h" | ||
|
|
||
| #include "hw/spapr.h" | ||
| #include "hw/spapr_vio.h" | ||
|
|
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| #include <libfdt.h> | ||
|
|
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| #define TOKEN_BASE 0x2000 | ||
| #define TOKEN_MAX 0x100 | ||
|
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| static struct rtas_call { | ||
| const char *name; | ||
| spapr_rtas_fn fn; | ||
| } rtas_table[TOKEN_MAX]; | ||
|
|
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| struct rtas_call *rtas_next = rtas_table; | ||
|
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| target_ulong spapr_rtas_call(sPAPREnvironment *spapr, | ||
| uint32_t token, uint32_t nargs, target_ulong args, | ||
| uint32_t nret, target_ulong rets) | ||
| { | ||
| if ((token >= TOKEN_BASE) | ||
| && ((token - TOKEN_BASE) < TOKEN_MAX)) { | ||
| struct rtas_call *call = rtas_table + (token - TOKEN_BASE); | ||
|
|
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| if (call->fn) { | ||
| call->fn(spapr, token, nargs, args, nret, rets); | ||
| return H_SUCCESS; | ||
| } | ||
| } | ||
|
|
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| hcall_dprintf("Unknown RTAS token 0x%x\n", token); | ||
| rtas_st(rets, 0, -3); | ||
| return H_PARAMETER; | ||
| } | ||
|
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| void spapr_rtas_register(const char *name, spapr_rtas_fn fn) | ||
| { | ||
| assert(rtas_next < (rtas_table + TOKEN_MAX)); | ||
|
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| rtas_next->name = name; | ||
| rtas_next->fn = fn; | ||
|
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| rtas_next++; | ||
| } | ||
|
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| int spapr_rtas_device_tree_setup(void *fdt, target_phys_addr_t rtas_addr, | ||
| target_phys_addr_t rtas_size) | ||
| { | ||
| int ret; | ||
| int i; | ||
|
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| ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size); | ||
| if (ret < 0) { | ||
| fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n", | ||
| fdt_strerror(ret)); | ||
| return ret; | ||
| } | ||
|
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| ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base", | ||
| rtas_addr); | ||
| if (ret < 0) { | ||
| fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n", | ||
| fdt_strerror(ret)); | ||
| return ret; | ||
| } | ||
|
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| ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry", | ||
| rtas_addr); | ||
| if (ret < 0) { | ||
| fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n", | ||
| fdt_strerror(ret)); | ||
| return ret; | ||
| } | ||
|
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| ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size", | ||
| rtas_size); | ||
| if (ret < 0) { | ||
| fprintf(stderr, "Couldn't add rtas-size property: %s\n", | ||
| fdt_strerror(ret)); | ||
| return ret; | ||
| } | ||
|
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| for (i = 0; i < TOKEN_MAX; i++) { | ||
| struct rtas_call *call = &rtas_table[i]; | ||
|
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| if (!call->fn) { | ||
| continue; | ||
| } | ||
|
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| ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name, | ||
| i + TOKEN_BASE); | ||
| if (ret < 0) { | ||
| fprintf(stderr, "Couldn't add rtas token for %s: %s\n", | ||
| call->name, fdt_strerror(ret)); | ||
| return ret; | ||
| } | ||
|
|
||
| } | ||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| all: build-all | ||
| # Dummy command so that make thinks it has done something | ||
| @true | ||
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| include ../../config-host.mak | ||
| include $(SRC_PATH)/rules.mak | ||
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| $(call set-vpath, $(SRC_PATH)/pc-bios/spapr-rtas) | ||
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| .PHONY : all clean build-all | ||
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| #CFLAGS += -I$(SRC_PATH) | ||
| #QEMU_CFLAGS = $(CFLAGS) | ||
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| build-all: spapr-rtas.bin | ||
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| %.img: %.o | ||
| $(call quiet-command,$(CC) -nostdlib -o $@ $<," Building $(TARGET_DIR)$@") | ||
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| %.bin: %.img | ||
| $(call quiet-command,$(OBJCOPY) -O binary -j .text $< $@," Building $(TARGET_DIR)$@") | ||
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| clean: | ||
| rm -f *.o *.d *.img *.bin *~ |
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